$$\int\left(x^2+3x^3-1\right)dx$$

$$sec\:x\:+\:csc\:x\:=\:sec\:x\:csc\:x\:\left(sen\:x\:+\:cos\:x\right)$$

$$\int x^2\cdot f^xdx$$

$$\frac{dy}{dx}+y=xy$$

$$6a+4\left(2a-3b\right)+5\left(2b-6c\right)-4c+8b$$

$$\lim_{x\to1}\left(\frac{e^{4x}-1}{3x^2+8x}\right)$$

$$7\left|\frac{3x\left(\frac{x}{2}\right)}{2}+3x\left(x\right)\right|$$