$\frac{d}{dx}21x^2=5y^2+3y$

$\frac{1-cos\left(x\right)}{sen\left(x\right)}=\frac{sem\left(x\right)}{1+cos\left(x\right)}$

$4m^2-5m+1$

$\int\ln\left(1+x^4\right)dx$

$12m^2-40m+25$

$\left(-1\right)^4-3\left(-1\right)^3-3\left(-1\right)^2+7\left(-1\right)+6$

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