$u^2-5u+2$

$6x^2-5\left(x-1\right)=x\left(x+1\right)+4$

$\frac{tan\left(x\right)+cos\left(x\right)}{sen\left(x\right)}-cot\left(x\right)=sec\left(x\right)$

$\left(-84\right)\left(+65\right)$

$\int_0^{\infty}\left(\frac{10\sin\left(x\right)}{x^2}\right)dx$

$\frac{dx}{dt}=\frac{\left(1+x^2\right)\pi t}{12\sqrt{1-t^2}}$

$\left(7+9^2\right)$