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OpenStudy (anonymous):
of tan(x)=4/3 and x is in quadrant 2 then cos(2x)=____ -7/25 7/25 3/5 -3/5
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OpenStudy (anonymous):
@dinamix
OpenStudy (anonymous):
is it -7/25
OpenStudy (lynfran):
|dw:1441297296751:dw|
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