$\sin a\:\left(1+cot\:a\right)=\sin a\:+\:cos\:a$
$x\frac{dy}{dx}+y=-8xy^2$
$-33a-21$
$25x^4-10x^3+x^2$
$5ab^2\:para\:a=1,b=2\:$
$4x^2=-3-8x$
$\int\left(x^2+1\right)^5dx$
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