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

$\int\left(\frac{x^7}{\sqrt{x^{16}+26}}\right)dx$

$64\left(z+y\right)^2-121\left(z-2\right)^2$

$4\left(-3m+6xy-15m\right)+12xy+20m-4$

$\frac{5}{x-1}-\frac{1}{x+1}=1$

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

$43^2-17^2$