$\lim_{x\to0}\left(\frac{\sqrt{2}}{\sin\left(x\right)}.\ln\left(\cos\left(x\right)\right)\right)$

$\left(\frac{1}{2}x+2\right)\left(\frac{1}{2}x+3\right)$

$2\left(x^2y^2\right)\left(3y^3x\right)$

$2+\tan\left(x\right)=3$

$-5\left(-7\right)$

$\sin^2x-3\sin x-4=0$

$34\:=\:-2x$