$1.2.\:\left(-3\right)\:+4\:$

$\left(x-2\right)^2+\left(x-3\right)^2\le\left(x-1\right)^2$

$\frac{dy}{dx}=\frac{4y+x^5}{x}$

$-9\left(8-10n\right)+3n$

$\lim_{x\to0}\left(\frac{2x^2-5x-3}{x-1}\right)$

$\cos\left(7a\right)\cos\left(4b\right)+\sin\left(7a\right)\sin\left(4b\right)$

$27m^6+64n^9$