$2\left(x-\frac{13}{4}\right)$

$\cos^{2}\left(3x\right)-\sin^{2}\left(3x\right)$

$m^2-25\:m-5$

$\left(a+b\right)^4-\left(a-b\right)^4+8ab\left(a+b\right)\left(a-b\right)$

$\left(\frac{5}{4}x+\frac{3}{2}y\right)^2$

$\cos\left(x\right)-\sqrt{2}\sin\left(x\right)=1$

$105\cdot3$