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

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

$\int te^{5t+\pi}dx$

$4x^2+20x+8=-6$

$2\left(f-9\right)+2\left(-3f+9\right)$

$x^2-4x-y=0$

$20x-5x^2$