$\left(3x^2+2x-5\right)+\left(7-3x+4x^2\right)$
$-3a+52a$
$\sin^2x-3\sin x=0$
$\int10\left(5x+3\right)^2dx$
$21.4\cdot3.6$
$3\sec x^2-4=0$
$\int\frac{5}{cos^2x}dx$
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