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OpenStudy (anonymous):
If cosx=4/5,cscx<0, then sin2x= cos2x= tan2x=
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OpenStudy (anonymous):
if cos x= 4/5 sinx = 3/5
OpenStudy (anonymous):
sin2x = 2 sinx cosx 2 *4/5 * 3/5 = 24/25
OpenStudy (anonymous):
cos2x = 1- 2cos^x
OpenStudy (anonymous):
tan2x = sin2x /coss2x
OpenStudy (anonymous):
easy to calculate the rest
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