$\lim_{x\to0}\left(\frac{1-sin\left(\frac{\pi}{2}-x\right)}{x}\right)$

$-6+3\left(2+\left(-4c\right)\right)$

$\left(\frac{2}{5}\right)^{12}.\left(\frac{3}{4}\right)^{14}$

$-4f^2-112f=-52$

$\frac{dy}{dx}=-2x\:+2$

$\left(-7a+8\right)+\left(a-4\right)$

$\frac{dy}{dx}\left(6sinxcosx\right)$