$\cos\left(a-\frac{\pi}{2}\right)=\sin\left(a\right)$

$\left(-1x^4y^8\right)^4$

$\lim_{x\to0}\sqrt[3]{\frac{\cos\left(mx\right)-\cos\left(nx\right)}{x^2}}$

$558\cdot513\cdot1465$

$5^{4x-x^2}=125$

$10-\left(3+2\right)^0+2$

$\int\left(\frac{1}{\left(x+1\right)^2+3}\right)dx$