$\left(23\right)-\left(43\right)-\left(18-54\right)$

$\frac{1}{2}ab-\frac{1}{2}ab$

$3x+8y=-6$

$\int_0^{\frac{\pi}{2}}\left(\sin^2\left(\pi x\right)\cos^4\left(\pi x\right)\right)dx$

$\frac{sin\left(x\right)^2}{1-sin\left(2x\right)}=\frac{sin\left(x\right)}{cos\left(x\right)-sin\left(x\right)}$

$\left(-14\right)\cdot\left(-6\right)$

$\frac{\left(x^2\right)^3}{x^{-4}}$