$\lim_{x\to0}\left(\frac{cos\left(mx\right)-cos\left(nx\right)}{x^2}\right)^{\frac{1}{x}}$
$-6<2x-4$
$\left(2b^2\right)^5\cdot b$
$\frac{d}{dx}\ln\left(3x^2-7x+3\right)$
$2 x - 11 = 3$
$\int\frac{7}{cos^2w}dw$
$\frac{c^3-8}{3c-2}$
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