Precalculus : Find the decimal value of a trigonometric function

Example Questions

Example Question #1 : Evaluating Trig Functions

Find the value of to the nearest tenth if and .      Explanation:

Rewrite in terms of sine and cosine. Substitute the known values and evaluate. The answer to the nearest tenth is .

Example Question #1 : Find The Decimal Value Of A Trigonometric Function

Determine the value of in decimal form.      Explanation:

Ensure the calculator is in radian mode since the expression shows the angle in terms of .  Also convert cotangent to tangent. Example Question #1 : Find The Decimal Value Of A Trigonometric Function

Find the decimal value of       Explanation:

To determine the decimal value of the following trig function, , make sure that the calculator is in radian mode.

Compute the expression. Example Question #1 : Evaluating Trig Functions

Determine the correct value of .      Explanation:

The question asks for the y-coordinate on the unit circle when the degree angle is .

Be careful not to confuse finding the value of the angle when the y-value of the coordinate of the unit circle is .

Ensure that the calculator is in degree mode. Example Question #2 : Find The Decimal Value Of A Trigonometric Function

Find the value of .      Explanation:

Before beginning this problem on a calculator, though this is not necessary since these are special angles, ensure that the mode of the calculator is in degrees.

Input the values of the expression and solve. All Precalculus Resources 