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Need help for the second part please (orange dot) Find the length of the curve Answer a.) x = et cost, y = et sint,0

Need help for the second part please (orange dot)

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Find the length of the curve Answer a.) x = et cost, y = et sint,0 S t s a a.) L = J Jzest dt = - 1 ) 2 ( I think ) . Find the surface area if the curve in #a is rotated about the y-axis I need help with this plz

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