$\lim_{x\to0}\left(7\sin\left(x\right)\ln\left(x\right)\right)$

$\left(x+4\right)\left(x-4\right)\left(-x+x\right)$

$\left(12y-4xy\right)\frac{dy}{dx}=1$

$34.21\cdot01$

$\frac{1}{\frac{x}{x}}$

$cos^4a\:-\:sin^4a\:+\:1=2\cos^2a$

$\left(2m-1\right)x^2+\left(m+1\right)x+\left(m-4\right)$