Fill in the blank with the acute angle that makes the statement true.

$\sin$sin$\editable{}$°$=$=$\cos25^\circ$cos25°

Complete the blank in the following expression:

Rewrite $\cos37^\circ$cos37° in terms of its cofunction.

Rewrite $\sin76^\circ$sin76° in terms of its cofunction.

Manipulate trigonometric expressions

Apply trigonometric methods in solving problems