$\frac{1}{s\left(2s+1\right)}$
$\left(x+3y-1\right)\left(2x+4y-3\right)$
$\csc\left(\frac{x}{2}\right)-2=0$
$\frac{\sec^2}{1+\cot}$
$41,258-3,258$
$sec^2x+csc^2x\:\left(tgx+ctgx\right)^2$
$20+90+517$
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