To Find n_th derivative of e^(2x) Sin3x Sin2x
In this quick tutorial we will learn how to find n_th derivative of a function which is in the form of e^ax. sinbx. sincx. So let us understand steps to reach n_th derivative very carefully.
Solution: let u = e2xe2x and v = Sin3x.Sin2xSin3x.Sin2x
Since we know that:
SinA.SinBSinA.SinB = [12][12] {cos(A-B) - cos(A+B)}
Now let: A = 3X And B = 2X
Therefore, (A-B)(A−B) = XX and (A+B)(A+B) = 5X5X
Also y=ex.12.{cos(A-B)-cos(A+B)}y=ex.12.{cos(A−B)−cos(A+B)}
Or y=12.{ex.cosX-ex.cos5X}y=12.{ex.cosX−ex.cos5X}
NthNth derivative of eAx.Cos(Bx+c)eAx.Cos(Bx+c) is:
= (A2+B2)n2.eAx.Cos(Bx+C+n.tan-1BA)(A2+B2)n2.eAx.Cos(Bx+C+n.tan−1BA)
So nthnth derivative of 12.[e2x.CosX]12.[e2x.CosX] is:
= 12.(22+12)n2.e2x.Cos(X+n.tan-112)12.(22+12)n2.e2x.Cos(X+n.tan−112)
= 12.52.e2x.Cos(X+n.tan-112)12.52.e2x.Cos(X+n.tan−112)
Similarly nthnth derivative of e2x.Cos5Xe2x.Cos5X as:
= 12.29n2.e2x.Cos(5X+n.tan-152)12.29n2.e2x.Cos(5X+n.tan−152)
Finally NthNth derivative of e2xSin3xSin2xe2xSin3xSin2x is:
= 12.52.e2x.Cos(X+n.tan-112)12.52.e2x.Cos(X+n.tan−112) - 12.29n2.e2x.Cos(5X+n.tan-152)12.29n2.e2x.Cos(5X+n.tan−152)
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