Question

If 0°<= 360°, solve the equation, sec x=-2
a. 150° and 210 °
b. 210° and 330°
c. 120° and 240°
d. 240° and 300°

I believe it is C. am i right?

Answer 1

sec (1/cos) is negative in the second and third quadrants. Memorize the sin and cosine curves. C is right.

Answer 2

thought so, thanks!