Note:- If y = sinx ; then dy/dx = cosx
If y = cosx ; then dy/dx = -sinx
2sinx*cosx = sin(2x)
`y = (sinx)^2`
`or, y = sin^2x`
`y' = 2sinx*cosx`
`or,y' = sin(2x)`
`y'' = 2cos(2x)`
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