Friend, this question is from Sample Question Paper-2 from R.D. Sharma. I have tried it today only but i am not getting the solution . If you got to know then please tell me also'

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=X³+Y³+3X²Y+3XY²+Y³+Z³+3Y²Z+3YZ²+Z³+X³+3Z²X+3X²Z-3XYZ-3X²Y-3XZ²-3X²Z-3Y²Z-3Y²X-3YZ²-3XYZ

=2X³+2Y³+2Z³-6XYZ

=2(X³+Y³+Z³-3XYZ)

LHS=RHS

HENCE PROVED