Note:- 1) 2sin(ax)*cos(ax) = sin2(ax)
2) If y = sinx ; then dy/dx = cosx
`h(x) = sin(2x)*cos(2x)`
`or, h(x) = (1/2)*sin(4x)`
`thus, h'(x) = (4/2)cos(4x)`
`or, h'(x) = 2cos(4x)`
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