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Question Number 68446 by 9102176137086 last updated on 10/Sep/19

cos (x−60)+cos (x−30)=sin x prove

cos(x−60)+cos(x−30)=sinxprove

Commented by mr W last updated on 10/Sep/19

not true! for x=30°: cos (30−60)+cos (30−30) =cos 30+1 =((√3)/2)+1 but sin 30=(1/2) ⇒LHS≠RHS

nottrue!forx=30°:cos(30−60)+cos(30−30)=cos30+1=32+1butsin30=12⇒LHS≠RHS

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