$\cos\left(100\right)=\sin\left(120\right)$

$\sec\left(x\right)-2\sin\left(x\right)=\frac{\left(\sin\left(x\right)-\cos\left(x\right)\right)^2}{\cos\left(x\right)}$

$-3x^3y^5z^7-8x^5y^7z^4$

$\left(3a+bc\right)^3$

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

$2cos^2$

$\left(\frac{t-2}{4-2}\cdot\frac{t-2.5}{4-2.5}\right)$