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

Cofunctions of Complementary Angles

2. Trigonometric Functions on Right Triangles / Cofunctions of Complementary Angles / Problem 2

Problem 2

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}$