Identify the cofunction equivalent to cos ⁡ 2 π 11 \cos\frac{2\pi}{11} cos 11 2 π .

sin ⁡ 7 π 22 \sin\frac{7\pi}{22} sin 22 7 π

csc ⁡ 9 π 11 \csc\frac{9\pi}{11} csc 11 9 π

sin ⁡ 9 π 11 \sin\frac{9\pi}{11} sin 11 9 π

sec ⁡ 7 π 22 \sec\frac{7\pi}{22} sec 22 7 π

8. Trigonometric Functions on Right Triangles

8. Trigonometric Functions on Right Triangles / Cofunctions of Complementary Angles / Problem 5

Problem 5

Identify the cofunction equivalent to $\cos\frac{2\pi}{11}$ .

$\csc\frac{9\pi}{11}$

$\sin\frac{9\pi}{11}$

$\sec\frac{7\pi}{22}$

$\sin\frac{7\pi}{22}$