$\sqrt{5^2}\cdot\sqrt{5}$
$81g^2-18g+4$
$2\cos^2x=0$
$\int\frac{2x+1}{x\left(x^2-x\right)}dx$
$2519-12$
$4x+1<-5$
$\cos^2\left(x\right)-\sin^2\left(x\right)=\cos^4\left(x\right)-\cos^4\left(x\right).\tan^4\left(x\right)$
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