Prove the "tan"("tan"^(-1)x +"tan"^(-1) ...

Prove the `"tan"("tan"^(-1)x +"tan"^(-1) y + "tan"^(-1)z)="cot"("cot"^-1x +"cot"^(-1) y+"cot"^(-1) z)`

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Prove the "sin"^(-1) sqrt((x-q)/(p-q))="cos"^(-1)sqrt((p-x)/(p-q))="co...
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