$\left(9m^2-16p^8\right)^2$

$28x^2-x-2$

$x^4-25x^2+144$

$-25\left|\left(-4\right)+\left(-2\right)\right|$

$\sec a\sin\left(a\right)^2+\cos\left(a\right)=\sec\left(a\right)$

$2a-\frac{6}{a}=a$

$\lim_{x\to\infty}\left(\frac{5x^3+x^2+9x+1}{9x\ln\left(x\right)+8}\right)$