$\int_0^{\frac{\pi}{2}}\left(\frac{sinx}{\sqrt{cosx}}\right)dx$
$\cos\alpha\cdot sen2\alpha=sen\alpha$
$0-\left(-15\right)$
$46w+7+w-8$
$\lim_{x\to0}\left(\frac{xlnx-1}{x-x^2}\right)$
$23\:x^2\:+8\:=\:27\:x^2-\:8$
$9\left(-5\right)-5\left(-1\right)+4\left(3\right)-\left(3\right)^2$
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