[" Frove that "2tan^(-1)((sqrt(x-3))/(a+b)tan(x)/(2))],[=cos^(-1)(a cos x+b)/(a)]

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2Tan^(-1)((sqrt(a-b))/(a+b)"tan"x/2)=

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tan ^(-1)(sqrt((1-cos 3 x)/(1+cos x)))