Question

For what x-value(s) does cos(x) = -1?

A. -360° and 360°
B. neither -360° nor 360°
C. -360°
D. 360

Answer 1

@iPwnBunnies The answer is C, right?

Answer 2

Nope. 360 degrees and -360 degrees are the same as 0 degrees. They're just coterminal angles, is the correct term. I may be wrong about that. But if you trace all 3 angles, it'll be the same position on the xy-coordinate plane. The cosine of 0 degrees is 1.Therefore, the cosine of 360 and -360 degrees are also 1.