1.

Prove that tan 70∘=tan 20∘+2tan 50∘. Or Prove that 1+cos2x+cos4x+cos6x=4cosx cos2x cos3x

Answer»

Prove that tan 70=tan 20+2tan 50.
Or

Prove that 1+cos2x+cos4x+cos6x=4cosx cos2x cos3x



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