Special Triangles, Unit Circle in Trigonometry
Precalculus · Flashcards
PRECALCULUS · FLASHCARDS
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QUESTION
What is
sin
(
2
π
−
x
)
\sin(2\pi-x)
sin
(
2
π
−
x
)
in terms of
sin
(
x
)
\sin(x)
sin
(
x
)
?
QUESTION
What identity expresses
cos
(
2
π
−
x
)
\cos(2\pi-x)
cos
(
2
π
−
x
)
in terms of
cos
(
x
)
\cos(x)
cos
(
x
)
?
QUESTION
What are the side ratios in a
π
4
\frac{\pi}{4}
4
π
-
π
4
\frac{\pi}{4}
4
π
-
π
2
\frac{\pi}{2}
2
π
triangle?
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ANSWER
1
:
1
:
2
1:1:\sqrt{2}
1
:
1
:
2
. 45-45-90 triangle has equal legs and hypotenuse = leg ×
2
\sqrt{2}
2
.
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