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Question

Show that :
(2r3s)(2r+3s)+(3s4q)(3s+4q)+(4q2r)(4q+2r)=0

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Solution

L.H.S=(2r3s)(2r+3s)+(3s4q)(3s+4q)+(4q2r)(4q+2r)

=4r29s2+9s216q2+16q24r2 using (a+b)(ab)=a2b2

=0=R.H.S

Hence proved.

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