$-18\cdot7$
$sin\left(\frac{\pi}{4}+\:x\right)+\:sin\left(\frac{\pi}{4}-x\right)$
$\lim_{x\to0}\left(\frac{\sin x-x}{e^{2x}}\right)$
$2\left(\frac{\cos\left(x\right)}{2}\right)$
$f\left(x\right)=-2x^4+5x^3-x$
$\lim_{x\to0}\left(\frac{1}{x^2}-\frac{1}{\sin\left(x\right)}\right)$
$a-3a+a$
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