dx/dy = 2cosy

ds=(1+(2cosy)^2 )^1/2 dy

ds=(1+4cos^2 y )^1/2 dy

ds=2/3(1+4cos^2y)^3/2 [(pi/9)-8*pi/9] [-sin^2(60)+sin^2(160)]

ds=2/3(1+4cos^2y)^3/2 [(pi/9)-8*pi/9 (-0.633)

it saids not correct :(

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