$49x^2-35x+6$

$-6x+12=30$

$\cos b\:.\:sec\:b=1$

$\frac{d^2}{dx^2}\left(x\cdot\left(x^2+1\right)^2\right)$

$\sqrt{x}^4y^2$

$\lim_{x\to0}\left(\frac{x\cdot\left(\tan\left(x\right)\right)^{-1}}{1-\cos\left(x\right)}\right)$

$\left(-9\right)\left(-1\right)\left(-5\right)\left(-7\right)$