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$f(x) = \begin{cases} x^2, & 0 \leq x < 1 \\ \sqrt{x}, & 1 \leq x \leq 2 \end{cases} \implies \int_0^2 f(x) \, dx = ?$

If $[\bullet]$ denotes the greatest integer function, then evaluate $\int_0^{2 \pi} [|\sin x| + |\cos x|] \, dx$.

Using the Trapezoidal rule, find the approximate value of $\int_1^4 y \, dx$ based on the following data:
$x$$1$$2$$3$$4$
$y$$0.7111$$0.7222$$0.7333$$0.7444$
(in $.1833$)

Evaluate $\int_{0}^{2}(x^{2}+3) dx$ as a limit of sums.

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The value of the $\int_{0}^{\frac{\pi}{2}} \left( \frac{1 + \sin 3y}{1 + 2\sin y} \right) dy$ is equal to

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