$\lim_{x\to1}\left(\frac{ln2x^2}{x^2-1}\right)$

$1-2cos^2\left(\theta\:\right)+cos^4\left(\theta\:\right)$

$1,4-1,3$

$\int_1^{\infty}\:\frac{7n}{8n-7}dx$

$\left(a+2\right)^2\cdot\left(a-2\right)^2$

$\left(x^2+3\right)\left(x-3\right)\left(x+4\right)$

$\frac{dy}{dx}=\left(asin5x+bcos5x\right)$