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Prove that : "tan"^(-1)sqrt((xr)/(yz)) ...

Prove that : `"tan"^(-1)sqrt((xr)/(yz)) +"tan"^(-1) sqrt((yr)/(yx)) +"tan"^(-1) sqrt((zr)/(xy)) = pi "where" r=x +y+z`.

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SHARAM PUBLICATION-INVERSE TRIGNOMETRIC FUNCTIONS-EXAMPLE
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