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OTP to be sent to Change
y=cos-12xv(1-x2)
dy/dx=-1/v{1-4x2(1-x2)}.2{x.(-2x)/2v(1-x2)+v(1-x2)}
=-1/v(4x4-4x2+1).2[-x2/v(1-x2) +v(1-x2)]
={-2/v(2x2-1)2 }.{-x2+1-x2}/v(1-x2)
=-2(-2x2+1)/{(2x2-1).v(1-x2)}
=2(2x2-1)/{(2x2-1).v(1-x2) }
=2/v(1-x2)
Thanks & regards
Rinkoo Gupta
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