Write the function in terms of its cofunction. Assume that any angle in which an unknown appears is an acute angle.
-cos 31.2°
A)cos 148.8°
B)sin 58.8°
C)sec 148.8°
D)sin 31.2°

Question

Quizplus · Accepted Answer

The cofunction identity states that sin(90° - θ) = cos(θ) for acute angles. Therefore, sin(90° - 31.2°) = sin(58.8°) is the correct transformation of cos(31.2°) into its cofunction.

Write the Function in Terms of Its Cofunction