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AP Calculus BC Flashcards: Implicit Differentiation

Study Implicit Differentiation in AP Calculus BC with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

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What this deck covers

This deck focuses on Implicit Differentiation, giving you a quick way to review the definitions, rules, and examples that matter most for AP Calculus BC.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

AP Calculus BC Flashcards: Implicit Differentiation

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QUESTION

Differentiate cos(x+y)=x\text{cos}(x + y) = xcos(x+y)=x implicitly.

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ANSWER

−sin(x+y)(1+dydx)=1-\text{sin}(x+y)(1 + \frac{dy}{dx}) = 1−sin(x+y)(1+dxdy​)=1. Chain rule: ddx[cos⁡(u)]=−sin⁡(u)dudx\frac{d}{dx}[\cos(u)] = -\sin(u)\frac{du}{dx}dxd​[cos(u)]=−sin(u)dxdu​.

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Flashcard 1: Differentiate cos(x+y)=x\text{cos}(x + y) = xcos(x+y)=x implicitly.

Answer: −sin(x+y)(1+dydx)=1-\text{sin}(x+y)(1 + \frac{dy}{dx}) = 1−sin(x+y)(1+dxdy​)=1. Chain rule: ddx[cos⁡(u)]=−sin⁡(u)dudx\frac{d}{dx}[\cos(u)] = -\sin(u)\frac{du}{dx}dxd​[cos(u)]=−sin(u)dxdu​.

Flashcard 2: Differentiate y3+3xy=6y^3 + 3xy = 6y3+3xy=6 implicitly.

Answer: 3y2dydx+3y+3xdydx=03y^2\frac{dy}{dx} + 3y + 3x\frac{dy}{dx} = 03y2dxdy​+3y+3xdxdy​=0. Power rule on y3y^3y3, product rule on 3xy3xy3xy term.

Flashcard 3: Differentiate y2+yx=1y^2 + yx = 1y2+yx=1 implicitly.

Answer: 2ydydx+y+xdydx=02y\frac{dy}{dx} + y + x\frac{dy}{dx} = 02ydxdy​+y+xdxdy​=0. Product rule on yxyxyx term, power rule on y2y^2y2 term.

Flashcard 4: Differentiate x2y+y2x=1x^2y + y^2x = 1x2y+y2x=1 implicitly.

Answer: 2xy+x2dydx+2yxdydx+y2=02xy + x^2\frac{dy}{dx} + 2yx\frac{dy}{dx} + y^2 = 02xy+x2dxdy​+2yxdxdy​+y2=0. Use product rule on both terms: x2yx^2yx2y and y2xy^2xy2x.

Flashcard 5: Find dydx\frac{dy}{dx}dxdy​ for x2+y2=1x^2 + y^2 = 1x2+y2=1.

Answer: dydx=−xy\frac{dy}{dx} = -\frac{x}{y}dxdy​=−yx​. Solve for dydx\frac{dy}{dx}dxdy​ by isolating it algebraically.

Flashcard 6: Differentiate xy=1\frac{x}{y} = 1yx​=1 implicitly.

Answer: y−xdydxy2=0\frac{y - x\frac{dy}{dx}}{y^2} = 0y2y−xdxdy​​=0. Use quotient rule: ddx[uv]=vdudx−udvdxv2\frac{d}{dx}[\frac{u}{v}] = \frac{v\frac{du}{dx} - u\frac{dv}{dx}}{v^2}dxd​[vu​]=v2vdxdu​−udxdv​​.

Flashcard 7: Find dydx\frac{dy}{dx}dxdy​ for xy=1xy = 1xy=1.

Answer: dydx=−yx\frac{dy}{dx} = -\frac{y}{x}dxdy​=−xy​. Solve for dydx\frac{dy}{dx}dxdy​ from the differentiated equation.

Flashcard 8: Differentiate xy=1xy = 1xy=1 implicitly.

Answer: y+xdydx=0y + x\frac{dy}{dx} = 0y+xdxdy​=0. Use product rule: ddx(xy)=y+xdydx\frac{d}{dx}(xy) = y + x\frac{dy}{dx}dxd​(xy)=y+xdxdy​.

Flashcard 9: Find dydx\frac{dy}{dx}dxdy​ for x2−xy+y2=7x^2 - xy + y^2 = 7x2−xy+y2=7.

Answer: dydx=2x−yx−2y\frac{dy}{dx} = \frac{2x - y}{x - 2y}dxdy​=x−2y2x−y​. Collect dydx\frac{dy}{dx}dxdy​ terms and solve for the derivative.

Flashcard 10: Differentiate ln(x+y)=x−y\text{ln}(x + y) = x - yln(x+y)=x−y implicitly.

Answer: 1x+y(1+dydx)=1−dydx\frac{1}{x+y}(1 + \frac{dy}{dx}) = 1 - \frac{dy}{dx}x+y1​(1+dxdy​)=1−dxdy​. Chain rule for ln⁡(x+y)\ln(x+y)ln(x+y) gives 1x+y(1+dydx)\frac{1}{x+y}(1 + \frac{dy}{dx})x+y1​(1+dxdy​).

Flashcard 11: Differentiate ex+y=xye^{x+y} = xyex+y=xy implicitly.

Answer: ex+y(1+dydx)=y+xdydxe^{x+y}(1+\frac{dy}{dx}) = y + x\frac{dy}{dx}ex+y(1+dxdy​)=y+xdxdy​. Chain rule on left, product rule on right side.

Flashcard 12: Differentiate x2+y2=4xyx^2 + y^2 = 4xyx2+y2=4xy implicitly.

Answer: 2x+2ydydx=4y+4xdydx2x + 2y\frac{dy}{dx} = 4y + 4x\frac{dy}{dx}2x+2ydxdy​=4y+4xdxdy​. Standard implicit differentiation with product rule on right.

Flashcard 13: State the chain rule for differentiation.

Answer: If y=f(u)y=f(u)y=f(u) and u=g(x)u=g(x)u=g(x), then dydx=dydu×dudx\frac{dy}{dx} = \frac{dy}{du} \times \frac{du}{dx}dxdy​=dudy​×dxdu​. Essential for differentiating composite functions.

Flashcard 14: Differentiate exy=ye^{xy} = yexy=y implicitly.

Answer: exy(y+xdydx)=dydxe^{xy}(y + x\frac{dy}{dx}) = \frac{dy}{dx}exy(y+xdxdy​)=dxdy​. Chain rule on left, product rule within exponent.

Flashcard 15: Differentiate x2+y2=1x^2 + y^2 = 1x2+y2=1 implicitly.

Answer: 2x+2ydydx=02x + 2y\frac{dy}{dx} = 02x+2ydxdy​=0. Apply ddx\frac{d}{dx}dxd​ to both sides, using chain rule for y2y^2y2 term.

Flashcard 16: Find dydx\frac{dy}{dx}dxdy​ for 1x+y=x−y\frac{1}{x+y} = x-yx+y1​=x−y.

Answer: dydx=(x+y)2−11+(x+y)2\frac{dy}{dx} = \frac{(x+y)^2 - 1}{1 + (x+y)^2}dxdy​=1+(x+y)2(x+y)2−1​. Solve by collecting dydx\frac{dy}{dx}dxdy​ terms on one side.

Flashcard 17: Find dydx\frac{dy}{dx}dxdy​ for x2y+y2x=1x^2y + y^2x = 1x2y+y2x=1.

Answer: dydx=−2xy−y2x2+2yx\frac{dy}{dx} = \frac{-2xy - y^2}{x^2 + 2yx}dxdy​=x2+2yx−2xy−y2​. Factor out dydx\frac{dy}{dx}dxdy​ from numerator and solve.

Flashcard 18: Differentiate sin(xy)=y\text{sin}(xy) = ysin(xy)=y implicitly.

Answer: cos(xy)(y+xdydx)=dydx\text{cos}(xy)(y + x\frac{dy}{dx}) = \frac{dy}{dx}cos(xy)(y+xdxdy​)=dxdy​. Chain rule on sin⁡(xy)\sin(xy)sin(xy) with product rule inside.

Flashcard 19: Find dydx\frac{dy}{dx}dxdy​ for y2+yx=1y^2 + yx = 1y2+yx=1.

Answer: dydx=−yx+2y\frac{dy}{dx} = \frac{-y}{x + 2y}dxdy​=x+2y−y​. Factor dydx\frac{dy}{dx}dxdy​ and solve for it algebraically.

Flashcard 20: Find dydx\frac{dy}{dx}dxdy​ for x2+2y2=3xyx^2 + 2y^2 = 3xyx2+2y2=3xy.

Answer: dydx=3y−2x4y−3x\frac{dy}{dx} = \frac{3y - 2x}{4y - 3x}dxdy​=4y−3x3y−2x​. Collect dydx\frac{dy}{dx}dxdy​ terms and solve for the derivative.

Flashcard 21: Differentiate x3+y3=6xyx^3 + y^3 = 6xyx3+y3=6xy implicitly.

Answer: 3x2+3y2dydx=6y+6xdydx3x^2 + 3y^2 \frac{dy}{dx} = 6y + 6x \frac{dy}{dx}3x2+3y2dxdy​=6y+6xdxdy​. Apply power rule to each cubic term, product rule to 6xy6xy6xy.

Flashcard 22: Find dydx\frac{dy}{dx}dxdy​ for xy=1\frac{x}{y} = 1yx​=1.

Answer: dydx=yx\frac{dy}{dx} = \frac{y}{x}dxdy​=xy​. From xy=1\frac{x}{y} = 1yx​=1, we get x=yx = yx=y, so slopes are equal.

Flashcard 23: Find dydx\frac{dy}{dx}dxdy​ for ln(x+y)=x−y\text{ln}(x + y) = x - yln(x+y)=x−y.

Answer: dydx=x+y−1x+y+1\frac{dy}{dx} = \frac{x+y-1}{x+y+1}dxdy​=x+y+1x+y−1​. Collect dydx\frac{dy}{dx}dxdy​ terms and solve algebraically.

Flashcard 24: Differentiate 1x+y=x−y\frac{1}{x+y} = x-yx+y1​=x−y implicitly.

Answer: −1(x+y)2(1+dydx)=1−dydx-\frac{1}{(x+y)^2}(1 + \frac{dy}{dx}) = 1 - \frac{dy}{dx}−(x+y)21​(1+dxdy​)=1−dxdy​. Use chain rule on 1x+y=(x+y)−1\frac{1}{x+y} = (x+y)^{-1}x+y1​=(x+y)−1.

Flashcard 25: Differentiate x2+2y2=3xyx^2 + 2y^2 = 3xyx2+2y2=3xy implicitly.

Answer: 2x+4ydydx=3y+3xdydx2x + 4y\frac{dy}{dx} = 3y + 3x\frac{dy}{dx}2x+4ydxdy​=3y+3xdxdy​. Apply power rule to each term, product rule to 3xy3xy3xy.

Flashcard 26: Differentiate ln(xy)=y2\text{ln}(xy) = y^2ln(xy)=y2 implicitly.

Answer: 1xy(y+xdydx)=2ydydx\frac{1}{xy}(y + x\frac{dy}{dx}) = 2y\frac{dy}{dx}xy1​(y+xdxdy​)=2ydxdy​. Chain rule on ln⁡(xy)\ln(xy)ln(xy) and product rule within.

Flashcard 27: Find dydx\frac{dy}{dx}dxdy​ for ex+y=xye^{x+y} = xyex+y=xy.

Answer: dydx=y−ex+yex+y−x\frac{dy}{dx} = \frac{y - e^{x+y}}{e^{x+y} - x}dxdy​=ex+y−xy−ex+y​. Collect dydx\frac{dy}{dx}dxdy​ terms and solve algebraically.

Flashcard 28: Differentiate x2−xy+y2=7x^2 - xy + y^2 = 7x2−xy+y2=7 implicitly.

Answer: 2x−y−xdydx+2ydydx=02x - y - x\frac{dy}{dx} + 2y\frac{dy}{dx} = 02x−y−xdxdy​+2ydxdy​=0. Apply power rule to x2x^2x2 and y2y^2y2, product rule to xyxyxy.

Flashcard 29: Find dydx\frac{dy}{dx}dxdy​ for y2+yx=1y^2 + yx = 1y2+yx=1.

Answer: dydx=−yx+2y\frac{dy}{dx} = \frac{-y}{x + 2y}dxdy​=x+2y−y​. Factor dydx\frac{dy}{dx}dxdy​ and solve for it algebraically.

Flashcard 30: Differentiate 1x+y=x−y\frac{1}{x+y} = x-yx+y1​=x−y implicitly.

Answer: −1(x+y)2(1+dydx)=1−dydx-\frac{1}{(x+y)^2}(1 + \frac{dy}{dx}) = 1 - \frac{dy}{dx}−(x+y)21​(1+dxdy​)=1−dxdy​. Use chain rule on 1x+y=(x+y)−1\frac{1}{x+y} = (x+y)^{-1}x+y1​=(x+y)−1.