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2tan^(-1)[tan(alpha)/(2)tan((pi)/(4)-(be...

2tan^(-1)[tan(alpha)/(2)tan((pi)/(4)-(beta)/(2))]" is equal to "

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2tan^(-1){tan.(alpha)/2tan(pi/4-beta/2)}" is equal to " alpha,beta,in (0,pi/2)

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