$1-x\le3$

$\left(2sinx-\sqrt{2}\right)\left(2cosx+\sqrt{2}\right)=0$

$\frac{dy}{dx}=\frac{tan\:x}{e^y}$

$3x^2+20x-975=0$

$\left(3\cos\left(x\right)+5\right)\left(5\sin\left(x\right)-3\right)$

$y\cdot\frac{dy}{dx}=\frac{\left(1-2x\right)}{y}$

$\left(\frac{2}{3}x-\frac{5}{6}\right).\left(\frac{2}{3}x+\frac{5}{6}\right)$