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OpenStudy (anonymous):
Verify the following identities 1. Cos3x over cosx=1-4sin^2 x 2.cosx-cosy over sinx+siny + sinx-siny over cosx+cosy=0
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OpenStudy (anonymous):
Helpppppppp
OpenStudy (anonymous):
@psymon
OpenStudy (anonymous):
for 2nd one -2sinx+y/2.sinx-y/2 over 2sinx+y/2.cosx-y/2 + 2cosx+y/2.sinx-y/2 over 2cosx++y/2.cosx-y/2
OpenStudy (anonymous):
which will be -tanx-y/2 + tanx-y/2 = 0
OpenStudy (anonymous):
Thanks
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OpenStudy (anonymous):
welcome
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