$racional\:2.3030030003$

$-\left|4\cdot\left(-1\right)\right|^3+4$

$\left(2\cdot x^2-\left(1+sin\left(x\right)\right)^4\right)$

$\left(-6x^2\right):\left(x^2\right)$

$2\cos^2\left(x\right)-\cos\left(x\right)=0$

$\left(4y-3\right)^3$

$\int\left(1-\cos\left(3x\right)\right)dx$