$y\left(x\right)=ae\left(-\frac{\left(x-m\right)}{2y}\right)^2$

$4x^2+2xy+3y=9$

$\int\left(2y^3\sqrt{5y^4+7}\right)dy$

$\int\frac{3x^4+4}{x^2\left(x^2+1\right)^3}dx$

$m^4+6m^2+25$

$\frac{sen7x-senx}{cosx-cos7x}$

$\frac{1}{1-\cos\left(x\right)}-\frac{1}{1+\cos\left(x\right)}=2\cot\left(x\right)\cdot\csc\left(x\right)$