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91Ó°ÊÓ

Find the arc length of one arch of y=sinx.

Short Answer

Expert verified

The length of one arc is 2Eπ,12≈3.82019.

Step by step solution

01

Given Information

The function is y=sinx.

02

Definition of the differential element of displacement.

The differential element of displacement is defined as ∫ds=∫dx2+dx2.

03

Find the value of Integral

The formula of differential element of displacement is ∫ds=∫dx2+dy2.

∫ds=∫dx21+dy2dx2∫ds=∫1+dy2dx2dx

Substitute the value given below in the equation mentioned above.

y=sinxdydx=cosx

The equation becomes as follows:

∫ds=∫1+cos2xdx∫ds=∫1+(1-sin2x)dx∫ds=∫2-sin2xdx∫ds=2∫1-sin2x2dx

The formula for the elliptical function is Eπ2,K=∫0π21-k2sin2θdθ.

The equation becomes as follows:

∫ds=2∫1-sin2x2dx∫ds=2Eπ,12∫ds≈3.82019

The length of one arc is 2Eπ,12≈3.82019.

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