$y'+y=y^2\:,\:y\left(0\right)=\frac{1}{3}$

$\int\frac{\sin\left(2x\right)}{\sqrt{1+\cos\left(x\right)^2}}dx$

$\left(7a^2-5b^3\right)\left(7a^2+5b^3\right)$

$\int\left(x+1\right)\sqrt{4.x+1}dx$

$x=2y$

$\left(3x-4f-5u\right)^2$

$\left(+3\right)-\left|\left(-9\right)-\left(+8\right)-\left(+7\right)+\left(-4\right)\right|+\left(-7\right)$