$2t^4+2t^2$
$2315\cdot23$
$+\frac{\frac{\cos a}{\sin a}}{1-\frac{\sin a}{\cos a}}$
$\int\frac{x^2+2x+1}{\left(x^2+3\right)^2}dx$
$6-x>4$
$\int3\:cos\:\left(2x-1\right)\:dx$
$5x^2-5x$
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