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Plz provide solution

Q.3. If ${\mathrm{tan}}^{-1}x+{\mathrm{tan}}^{-1}y=\frac{4\mathrm{\pi}}{5},findco{t}^{-1}x+co{t}^{1}y$

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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