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tan[cos−1(sin(cos−1x))+sin−1(cos(sin−1x))2]= ?\tan \left[ \dfrac{\cos^{-1} \left( \sin \left( \cos^{-1}x \right) \right) + \sin^{-1} \left( \cos \left( \sin^{-1}x \right) \right)}{2} \right]= \, ?tan[2cos−1(sin(cos−1x))+sin−1(cos(sin−1x))]=?
Clarification: sin−1x∈[0,π2]\sin^{-1}x \in \left[ 0, \frac{\pi}{2} \right]sin−1x∈[0,2π].
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