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If x^2+y^2+z^2=r^2, " then " tan^(-1) ""...

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

A

`pi`

B

`(pi)/(2)`

C

0

D

None of these

Text Solution

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The correct Answer is:
B
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