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

sin ⁡ 7 π 22 \sin\frac{7\pi}{22}

csc ⁡ 9 π 11 \csc\frac{9\pi}{11}

sin ⁡ 9 π 11 \sin\frac{9\pi}{11}

sec ⁡ 7 π 22 \sec\frac{7\pi}{22}

Cofunctions of Complementary Angles

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

Problem 2

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

$\csc \frac{9 π}{11}$

$\sin \frac{9 π}{11}$

$\sec \frac{7 π}{22}$

$\sin \frac{7 π}{22}$