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OpenStudy (anonymous):
if cosx=-3/4, find cos2x
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OpenStudy (anonymous):
cos2x=2(-3/4)^2-1...from here I a struggling coming up w all different answers
OpenStudy (anonymous):
Thats 2(9/16) - 1 = 18/16 - 1 = 18/16 - 16/16 = 2/16 = 1/8
OpenStudy (anonymous):
thanks
OpenStudy (anonymous):
welcome.
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