if cos^{-1}x + cos^{-1}y + cos^{-1}z = pi

prove that x^{2} + y^{2} + z^{2} +2xyz = 1

the given equation is :

...........(1)

since where

therefore

i.e

squaring on both sides:

hope this helps you.

cheers!!

**
**

if cos^{-1}x + cos^{-1}y + cos^{-1}z = pi

prove that x^{2} + y^{2} + z^{2} +2xyz = 1

the given equation is :

...........(1)

since where

therefore

i.e

squaring on both sides:

hope this helps you.

cheers!!

**
**

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