Find all angles in degrees that satisfy the equation.
-cos x = 0
A) x | x = n360°
B) x | x = 90° + n180°
C) x | x = n180°
D) x | x = 90° + n360°

Question

Quizplus · Accepted Answer

The cosine function equals zero at angles where the angle's terminal side lies along the y-axis, which occurs at 90° and 270°, or more generally, at 90° + n180°, where n is any integer. This is because as you add 180° to 90°, you alternate between the positive and negative y-axis, where the cosine value is zero.

Find All Angles in Degrees That Satisfy the Equation