$\sec^4\left(x\right)-2\sec^2\left(x\right)\cdot\tan^2\left(x\right)+\tan^4\left(x\right)$

$4+2-23$

$dy+\left(y\tan\left(x\right)-\cos^2\left(x\right)\right)dx=0$

$\lim_{x\to0}\frac{3-3\cos7t-6\sin7t}{3t}$

$\int\left(3x^3-1\right)\left(5+x\right)dx$

$80m^2+64m^4+64m^3+32m+16-64m^4-64m^3-80m^2-64m-16$

$\lim_{x\to-1}\left(7x^6+12x^5+40x^4\right)$