$\frac{d}{dx}\left(x^2-3xy+2y^2+4=0\right)$

$no\:one\:ask$

$4x+6>4\left(x+6\right)$

$\left(2\sin-1\right)\left(2\sin+1\right)=0$

$\lim_{x\to1}\left(\frac{3x^2}{e^{2x-2}-x^2}\right)$

$\lim_{x\to-1}\left(\frac{8x^2+16x}{5x+5}\right)$

$\int\left(\frac{e^{6x}}{\left(e^{6x}-11\right)^5}\right)dx$