$3f-12=-3$

$\lim_{x\to0}\left(\frac{e-\left(1+x\right)^{\frac{1}{x}}\cdot x}{x}\right)$

$\lim_{x\to\infty}x^3\left(\frac{2}{x}-\sin\left(\frac{2}{x}\right)\right)$

$5\sin\:\left(x\right)^2-2\cos\:\left(x\right)=0$

$\int\frac{\left(2x-1\right)}{\left(x^2+4\right)\left(x+1\right)}dx$

$2\left(3y+10\right)=38$

$-8ab^2\cdot\left(-7a^2b\right)$