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If tan ^(-1 )""(yz )/( xr ) + tan ^(...

If ` tan ^(-1 )""(yz )/( xr ) + tan ^(-1 )""(zx)/(yr) + tan ^(-1) ""(xy)/(zr) =(pi)/(2) `, prove that , ` x^(2) + y^(2) + z^(2) + r^(2) `

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