$0,52+0,27$
$-5s^2+-s^2+-2s^2$
$\left(2b+3\right)\left(3b-4\right)$
$-2r^2+12r+74=0$
$\left(4x+y^3\right)^2$
$\sqrt{\frac{\left(x^3-1\right)}{\left(x^3+1\right)}},\:u$
$sin\left(3v\right)cos\left(v\right)-sin\left(2v\right)cos\left(2v\right)$
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