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Solution of the equation cot (overset (...

Solution of the equation `cot (overset (4) underset (r =1) sum cot ^-1 2 r^2)=(3 x+4)/(3 x+2)` is equal to

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  19. Let x=tan ^-1(tan 2)+tan (tan ^-1 2), then [x]+sgn(x) is equal ...

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