$5cosx+6=10cosx+5$
$\int x\left(2x+\sqrt{3}\right)dx$
$\:cos\:2\:x\:+\:2\:=\:\:sin\:x\:\:$
$\frac{4x-5}{7x}<2$
$23,para\:4$
$20+400-3098\cdot$
$\left(3a^2+4a^ab^3\right)^2$
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