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Arithmetic mean of the non-zero solution...

Arithmetic mean of the non-zero solutions of the equation `tan^-1 (1/(2x + 1)) + tan^-1 (1/(4x + 1)) = tan^-1 (2/x^2)`

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ALLEN -INVERSE TRIGONOMETRIC FUNCTIONS-All Questions
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  18. Solve the following inequality: sin^(-1) x > cos^(-1) x

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  19. Find the number of positive integral solution of the equation tan^(-1)...

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