$$\left(\left(x-1\right)-9x\right)\left(\left(x-1\right)+9x\right)$$

$$\left(1+\sqrt[2]{3}x\right)\left(1-\sqrt[2]{3}x\right)$$

$$f\left(x\right)=\left(x^3+x-1\right)^2$$

$$\frac{\csc\left(t-1\right)}{\cot\left(t\right)}$$

$$\sin\left(x\right)\left(e^{-y}\right)dx=\left(1+\cos\left(x\right)\right)dy$$

$$-6+8\left(-15\right)+20-40$$

$$37-\left(-4\right)$$