x(t) = cos t and y(t) = sin t cos t. I know that by symmetry, I just take 4 times the area in the first quadrant. 4 {integral 0 to pi/2} f(t)dt But I don't know how to set up the function. Thanks in advance.
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$\displaystyle \sqrt{\left( \frac{dx}{dt} \right)^{2}+\left( \frac{dy}{dt} \right)^{2}}.$
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