$\frac{d^2}{dx^2}\left(7sin\left(x\right)+3cos\left(x\right)\right)$

$\left(-10\right)^{12}:\:\left(-10\right)^{10}-5.\left(-3+2\right)$

$\frac{z^4}{z^3}$

$y^{10}d^{10}y^{-4}d^{20}$

$4y^2-24y$

$\lim_{x\to1}\left(x^{\frac{1}{x^2-1}}\right)$

$6\left(7\:-\:x\right)=\:8\left(6-x\right)$