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Subtact 3 xy + 5 yz - 7x from 5 xy - 2 y...

Subtact `3 xy + 5 yz - 7x` from `5 xy - 2 yz - 2zx + 10 xyz`
solving using column method, we have.

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Statement I If tan^(-1) x + tan^(-1) y = pi/4 - tan^(-1) z " and " x + y + z = 1 , then arithmetic mean of odd powers of x, y, z is equal to 1/3 . Statement II For any x, y, z we have xyz - xy - yz - zx + x + y + z = 1 + ( x - 1) ( y - 1) ( z - 1)