$-x+x^2-3x^2$

$\csc\left(x\right)\left(1-\cos\left(x\right)\right)=\sin\left(x\right)$

$\frac{540}{4.5}$

$25x^2+9y^2-18y-216=0$

$\frac{2}{2^{\frac{1}{2}}\pi\:^{\frac{1}{2}}a}\cdot\:\frac{2\pi\:^{\frac{1}{2}}}{2^3\left(\frac{1}{2a^2}\right)^{\frac{3}{2}}}$

$x^2-18x=-65$

$3\left(c^{3}b^{4}\right)^{2}$