$-4\cdot\left(1+7\right)$
$14x^2-17x$
$8^2-7$
$5x+7=2\left(x+8\right)$
$\lim_{x\to0}\left(\frac{\ln\left(1+x^2\right)}{\cos\left(x-1\right)}\right)$
$\int\left(\frac{4x-1}{6x^2-3x+2}\right)dx$
$\sin\left(x-\pi\right)=\sin\left(x\right)$
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