$\cos^{-1}\left(\cos\frac{4\pi}{5}\right)$
$-2\cdot\left(5-8\right)$
$\lim_{x\to\infty}\left(\sqrt{x^2+4x}-1\right)$
$4\csc\left(x\right)^2-9$
$\left(sin\left(x\right)+1\right)sec\left(x\right)$
$\int e^{-st}\cdot sin\left(at\right)dt$
$\int\left(y^2\right)dy$
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