$$\int7\:\ln\left(x\right)dx$$

$$\lim_{x\to0}\left(\frac{\sin^2\cdot x^2}{x^2}\right)$$

$$\lim_{x\to0}\left(\frac{\cos\left(x\right)-1}{\cos\left(x\cdot1\right)-1}\right)$$

$$-15t\ge-45$$

$$\int\frac{\left(y^4-9\right)}{y^3+2y^2}dy$$

$$4x-7y+8z-9x+12y-15z-2x+3y-4z$$

$$16+40^2+25^4$$