$$\int\left(\frac{x}{12\:+\:x^4}\right)dx$$

$$2x+3x-5x+8x-9x$$

$$\cos\left(2.5868\right)$$

$$\frac { 4 } { x } = 2$$

$$\frac{sen^2x\:\left(1-cos\:x\right)}{\left(1-cos\:x\right)\left(1-cosx\right)}$$

$$\left(3+2\right)^2-122$$

$$\left(6x+5>4x+11\right)\:n\:\left(4-2x>10-5x\right)$$