$\left(4x^2+6x+3\right)-\left(5x^4+4x-3\right)$

$3x-5+6x+9-11+8x$

$\frac{dy}{dx}-2y=3e^{2x},\:y\left(0\right)=0$

$\frac{1}{1-\sin\left(x\right)}+\frac{1}{1+\sin\left(x\right)}=2\cos\left(x\right)^2$

$4x^2-4x-39$

$3y^4-2y+y^2-18y^2+12y^2-6y$

$\int\left(\frac{\sqrt{\tan\left(x\right)}}{\cos^2\left(x\right)}\right)dx$