VIII. Prove that 2 tan-tuatan 1 = cos-1673 Vatb a+b cose

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Fonmula: ( Q cdot tan ^{-1}(x)=operatorname{Oog}^{-1}left(frac{1-x^{2}}{1+x^{2}}right) ) ( 80,2 tan ^{-1}|sqrt{frac{a-b}{a+b}} cdot tan theta / 2| )

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