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

$5\left(x+a\right)-3\left(x+a\right)$

$0\cdot\ln\left(0\right)-0$

$7\left(3x+3\right)\:+5$

$\lim_{x\to2}\left(\frac{\sqrt{x}-\sqrt{2}}{x+2}\right)$

$x^2-3x-70=0$

$288+50\cdot1+35\cdot2^2-1500\cdot\left(-5\right)^0\cdot2^0\cdot\left(-3\right)^0$