$149\le26s+45$
$\tan\left(\frac{\pi}{4}-x\right)=\frac{1-\tan\left(x\right)}{1+\tan\left(x\right)}$
$sin2\:x\:+\:cos\:x$
$49x^2-121y^2$
$2xydx+\left(x^2-y\right)dy=0$
$\int2x^2\left(x^3+5\right)^9dx$
$\frac{-3x+1}{\left(x+1\right)^2}$
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