Use part 1 of the fundamental therom of calculus to find the derivative of the function. The integral if from 0 to tan[x] y= integral of sqrt[t+sqrt{t}]dt
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$\displaystyle \frac{d}{dx} \left[ \int_a^u f(t) \, dt \right] = f(u) \cdot \frac{du}{dx}$ where u is a function of x and a is a constant.
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