$\frac{d^2}{dy^2}\left(2y\cos\left(x\right)\right)$

$tan^2\left(a\right)cos^2a+cot^2\left(a\right)sin^2\left(a\right)=1$

$2-n-7n$

$a^2+12a+35$

$\left(6m-5c\right)^2$

$\cos^4\left(x\right)-\sin^4\left(x\right)=\cos2\left(x\right)$

$\left(\frac{\left(14a^2b^7\right)}{2a^5b}\right)^{-2}$