1.

If x^(2) + y^(2) + z ^(2) =r^(2), thentan^(-1) ((xy)/(zr)) + tan ^(-1) ((yz)/(xr)) + tan ^(-1) ((zx)/(yr))= ?

Answer»

`(pi)/(4)`
`(pi)/(6)`
`(pi)/(2)`
`pi`

ANSWER :C


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