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divide both sides by cos x to give
tan x = 1

okay got that

the tangent is positive in the first and 3rd quadrants

so that gives me pi/4, 7pi/4?

pi/4 is correct

|dw:1364766655163:dw|

I have two options with pi/4.. they are 7pi/4 or 5pi/4

5pi/4 is correct

pi/4 is in third quadrant