$\frac{d^{14}}{dx^{14}}\left(2\cdot\cos\left(x\right)\right)$
$\lim_{x\to\infty}\left(\frac{x^3-5}{x^2+7x+1}\right)$
$1+\cos\left(x\right)^2=1$
$7+25+-1$
$x^2+10x-750$
$\left(-3\right)+\left(+12\right)+\left(-6\right)+\left(+7\right)+\left(+15\right)+\left(-4\right)+\left(+16\right)+\left(-19\right)$
$\frac{\sin\left(-x\right)}{-\cos\left(x\right)}$
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