$\left|-23\right|\:\:\:23$

$7\left(-1\right)^4\left(1\right)^2+4\left(1\right)^3\left(-1\right)^2$

$\left(x^{-2}-1\right)^4$

$\lim_{x\to\infty}\left(\frac{3x^4-\sqrt{x}}{x^4-3x^{-1}}\right)$

$\left(6a-8b+5c\right)+\left(4a-10b-5c\right)$

$\lim_{a\to h}\left(\frac{\left(a-h\right)^2-a^2}{h}\right)$

$\int\sin\left(3y\right)\cos\left(5y\right)dy$