Plz provide solution
Q.3. If
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/if-tan-1x-tan-1y-4pie-3-then-find-cot-1x-cot-1y/inverse-trigonometric-functions/11621585
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https://www.meritnation.com/ask-answer/question/if-tan-1x-tan-1y-4pie-3-then-find-cot-1x-cot-1y/inverse-trigonometric-functions/11621585
Regards