$2\cos\left(2x\right)=2\sin\left(2x\right)$
$\left(-a\:\right)^{4\cdot0}$
$5a^2b-25ab=6b^2+3b$
$5\left|7-8\right|\left|+4\right|\left|4+11\right|$
$x^2-13x+42=0$
$4x=80$
$6\left(x+1\right)=25.158$
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