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OpenStudy (anonymous):
Given cos x = -4/7, find cos 2x (assume x is in Quadrant III)
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terenzreignz (terenzreignz):
Okay... if x is in quadrant 3, where is 2x?
OpenStudy (anonymous):
no clue. Thats what i'd like to know as well..
terenzreignz (terenzreignz):
Do you work with degrees or radians?
OpenStudy (anonymous):
radians
terenzreignz (terenzreignz):
Okay, if x is in the third quadrant (Q3) then \[\huge \pi < x < \frac{3\pi}{2}\] That said, where is 2x?
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