Asked by sophie

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?
Answered by bobpursley
sec (1/cos) is negative in the second and third quadrants. Memorize the sin and cosine curves. C is right.
Answered by sophie
thought so, thanks!
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