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yadiraa4
Apr 29, 2012, 09:40 PM
Prove the identity: cosxcotx+sinx=cscx

yadiraa4
Apr 29, 2012, 09:41 PM
If cosx= -2/3 and pi/2, find the exact value of cos(pi/3-x)

yadiraa4
Apr 29, 2012, 09:41 PM
Given cos x=2/3 and 3pi/2<x<2pi, find the exact value of cos2x?