$ln\left(cos\left(x\right)\right)=1$

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

$\int_0^{\pi}\left(21\sin\left(x\right)\right)dx$

$y+\left(3-y\right)\cdot e^{4x}$

$-11x+6>-8x+9$

$16x+9=9y$

$-y+6y^2+3y^2+5y+4y+3-1$