$4xe^{-y}dx+dy=0;y\left(0\right)=1$

$\frac{dy}{dx}+4y=\frac{4}{3}$

$\frac{sin3a}{sina}+\frac{cos3a}{cosa}=4cos\left(2a\right)$

$\int3x^2\sec^2\left(x^3+2\right)dx$

$\int_1^2\left(\frac{4x^2-2x-12}{x\left(x+2\right)\left(x-3\right)}\right)dx$

$\left(18x^4y^2\right)-\left(12x^2y^2\right)$

$\left(a\:-\:3b\:-\:4c\right)^2$