The value of {tan ^{ - 1}}left( {frac{x}{y}} | vedclass

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Question

(A) Given expression: ${	an ^{ - 1}}\left( {\frac{x}{y}} ight) - {	an ^{ - 1}}\left( {\frac{{x - y}}{{x + y}}} ight)$Divide the numerator and de

Vedclass · Accepted Answer

$\frac{\pi }{4}$

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(A) Given expression: ${	an ^{ - 1}}\left( {\frac{x}{y}} ight) - {	an ^{ - 1}}\left( {\frac{{x - y}}{{x + y}}} ight)$Divide the numerator and denominator of the second term by $x$:${	an ^{ - 1}}\left( {\frac{x}{y}} ight) - {	an ^{ - 1}}\left( {\frac{{1 - y/x}}{{1 + y/x}}} ight)$Using the formula ${	an ^{ - 1}}A - {	an ^{ - 1}}B = {	an ^{ - 1}}\left( {\frac{{A - B}}{{1 + AB}}} ight)$,we can write:${	an ^{ - 1}}\left( {\frac{{1 - y/x}}{{1 + 1 \cdot (y/x)}}} ight) = {	an ^{ - 1}}(1) - {	an ^{ - 1}}\left( {\frac{y}{x}} ight)$Substituting this back into the expression:${	an ^{ - 1}}\left( {\frac{x}{y}} ight) - \left( {\frac{\pi }{4} - {	an ^{ - 1}}\left( {\frac{y}{x}} ight)} ight)$Since ${	an ^{ - 1}}\left( {\frac{y}{x}} ight) = {\cot ^{ - 1}}\left( {\frac{x}{y}} ight)$:${	an ^{ - 1}}\left( {\frac{x}{y}} ight) + {\cot ^{ - 1}}\left( {\frac{x}{y}} ight) - \frac{\pi }{4}$Using the identity ${	an ^{ - 1}}	heta + {\cot ^{ - 1}}	heta = \frac{\pi }{2}$:$\frac{\pi }{2} - \frac{\pi }{4} = \frac{\pi }{4}$.

The value of ${\tan ^{ - 1}}\left( {\frac{x}{y}} \right) - {\tan ^{ - 1}}\left( {\frac{{x - y}}{{x + y}}} \right)$ is

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