91Ó°ÊÓ

Use the cofunction identities to fill in the blanks. $$\sin 60^{\circ}=\cos$$__

Use the cofunction identities to fill in the blanks. $$\sin 45^{\circ}=\cos$$__

Solve the given trigonometric equation exactly over the indicated interval. \(\tan \theta=0,\) all real numbers

Write the trigonometric function values in terms of its cofunction. $$\cos \left(20^{\circ}+A\right)$$

Find the exact value of each expression. Give the answer in radians. $$\sec ^{-1}(-2)$$

Write the trigonometric function values in terms of its cofunction. $$\sec \left(30^{\circ}-\theta\right)$$

Simplify each expression. Evaluate the resulting expression exactly, if possible. $$\sin 15^{\circ} \cos 15^{\circ}$$

Write each expression as a product of sines and/or cosines. $$\sin (3 x)-\sin x$$

Find the exact value of each expression. Give the answer in degrees. $$\cos ^{-1}\left(-\frac{\sqrt{3}}{2}\right)$$

Simplify each of the trigonometric expressions. $$\sec (-x) \tan (-x) \cos (-x)$$