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

$$\csc^2x\cot x$$

$$2x+3\ge13$$

$$5xy-y=9x+4y$$

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

$$1-a<0$$