$\lim_{x\to\infty}\left(\frac{1}{\sqrt{1+\sqrt{\frac{1}{\sqrt{x}}}}}\right)$

$cot^{\left(2\right)}xcos^{\left(2\right)}x=cot^{\left(2\right)}x-cos^{\left(2\right)}x$

$8+5\:.\:\:\left|\left(-2\right)-\left(+5\right).\left(-2\right)\right|$

$4a^2+28a+49$

$\left(-\frac{7x^5z^5}{y^5}\right)^3$

$\frac{dy}{dx}=e^{-y+sinx}.\cos\left(x\right)$

$\left(2xy+x^2+3y^2\right)y'\:+\left(y^2+2xy+3x^2\right)=0$