$\sin\left(x\right)\left(\tan\left(x\right)+\cot\left(x\right)\right)=\sin\left(x\right)$

$\int-7x^5\left(x^6-1\right)^{15}dx$

$\lim_{x\to\frac{\pi}{2}}\left(6cos\left(7x\right)sec\left(-9x\right)\right)$

$2\sin\left(x\right).\tan\left(x\right)$

$1-\cos\left(x\right)-\frac{1}{2}\left(\sin\left(x\right)-\cos\left(x\right)+1\right)$

$216r^3+64v^3$

$9x^2+30x+25=0$