1.

If sin A=1/2then show that3 cos A-4 cos? A = 0.​

Answer»

-STEP EXPLANATION:GIVEN sinθ=21⟹θ=6πLHS=3cosθ−4cos3θ=3cos6π−4cos36π=233−4(23)3=233−4×833=233−233=0=RHS



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