$\cos\left(x\right)^2+4\sin\left(x\right)^2\cdot\cos\left(x\right)^2=1$

$\int7x\left(5x+4\right)^2dx$

$-2-3-1-4-2-9-5-1-6$

$\left(4a+1\right)\left(1+4a\right)$

$\lim_{x\to1}\left(\frac{1-4sin^2\frac{\pi x}{6}}{1-x^2}\right)$

$3ydx=-\left(xy+5x\right)dy$

$\left(2a^{-7}b^{4}\right)^{4}$