inv-trig

Question: ${{\tan }^{-1}}\left( \frac{x}{y} \right)-{{\tan }^{-1}}\,\left( \frac{x-y}{x+y} \right)$ is

1) $\frac{\pi }{2}$

2) $\frac{\pi }{3}$

3) $\frac{\pi }{4}$

4) $\frac{\pi }{4}$or $-\frac{3\pi }{4}$

Solution:

Explanation: No Explanation

Inverse trigonometric functions

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