$\left(\frac{1}{3}x+\frac{2}{7}y\right)\left(\frac{1}{3}-\frac{2}{7}y\right)$

$f\left(1\right)=\frac{x^2-2x+1}{x-1}$

$1-2\sin\left(x\right)+\sin\left(x\right)^4=\cos\left(x\right)^4$

$-3x\ge-18$

$8q^3+64$

$\int\frac{x+4}{x\left(x^2+2x+5\right)}dx$

$\int\left(4+x^2\right)^2dx$