$f\left(-4\right)=-2^3+x^2-15$
$\frac{\left(3x+5\right)}{x+2}+\frac{\left(2x-3\right)}{x+7}$
$7x^4\cdot6$
$\lim_{x\to0}\left(\ln\left(\sin\left(2x\right)\right)^x\right)$
$-34\cdot13$
$\frac{3x^2+8x-2}{3x-4}\le x-2$
$\lim_{h\to0}\left(\frac{\left(4+h\right)^3+643}{h}\right)$
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