`f(x) = sinx*ln(5x)`
`f'(x) = cosx*ln(5x) + sinx/x`
Note:- If y = sinx ; then dy/dx = cosx
If y = lnx ; then dy/dx = 1/x
If y = u*v ; where 'u' & 'v' are functions of 'x'; then dy/dx = u*v' + v*u'
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