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" tan' "(1)/(11)+tan^(-1)(2)/(11)" is iq...

" tan' "(1)/(11)+tan^(-1)(2)/(11)" is ique "

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tan^(-1)(1/(11))+tan^(-1)(2/(11)) is equal to (a) 0 (b) 1//2 (c) -1 (d) none of these

tan ^(-1) (1/11)+tan ^(-1)(2/12)=

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tan^(-1)((1)/(2))+tan^(-1)((2)/(11))=

tan^(-1)((1)/(4))+tan^(-1)((2)/(11))=

Show that tan^(-1)""(1)/(2) + tan^(-1)""(2)/( 11) + tan^(-1)""(4)/(3) = (pi)/(2)

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