hi,
you may use the differentiate formula,
dy/dx
suppose here y=e^3x,
formula for d[e^x]/dx is, e^x, now take the whole 3x as x , by using this formula you will get e^3x, here 3x is also a function of x, so we need to again differentiate it with respect to x, the final result will be 3* e^3x.
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