$\int_{\frac{1}{2}}^{1\sqrt{2}}\frac{4}{\sqrt{1-x^2}}dx$
$-4z+1=bz+c$
$5x\:-\:2y\:+\:\:3z\:-\:2x\:+\:y\:-\:\left[\:x\:-\:\left(\:2x\:+\:3y\:+\:z\right)\:+\:2y\:\right]\:$
$\:-5\left(3k-6\right)+6$
$5cosxtanx-7tanx=0\:$
$-21x^3y\sqrt{10y}+-108x^3y\sqrt{5y}$
$sec\left(2x\right)=-1.305$
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