$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$sin\left(5\left(\frac{\pi}{4}\right)-\pi\right)$
$\lim_{x\to1}\left(x-5\right)$
$-9x^2+2x+x^3+x^2+2$
$\left(-5b+2n\right)^2$
$2\left(3x+4\right)^2$
$\log_b\left(b^f\right)=f$
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