$1+16n^2=17$
$\left(2x-1\right)^2-225=0$
$\left(49-x\right)^2$
$\:\sin\:\left(30^{\circ\:}\:+\:x\right)\:-\cos\:\left(60^{\circ\:}\:+\:x\right)=\:-\frac{\sqrt{3}}{2}$
$\left(m^2-n\right)^3$
$\int\:\:x^2\left(x^3+6\right)^3dx$
$9,375-7,5$
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