$$100=\:70sin\left(\frac{\pi}{30}x\right)+10$$

$$=\frac{2x\sqrt{3-3x}}{e^{4x}\left(sin^2\left(x\right)\right)}$$

$$9x^2-18x-36$$

$$\frac{48s^4t^8}{15s^3t^2}$$

$$\left(2x+6\right)\left(3x+2\right)\:-\:\left(6x+1\right)\left(x-5\right)$$

$$\lim_{x\to0}\left(\frac{x^2-\sin\left(x^2\right)}{\sin^2\left(x\right)+2x\sin\left(x\right)\cos\left(x\right)}\right)$$

$$\lim_{x\to3}\left(\frac{\sqrt[2]{x}-\sqrt[2]{3}}{x-3}\right)$$