$\frac{1+\sin\left(-x\right)}{1+\csc\left(-x\right)}=-\sin\left(x\right)$
$\frac{dy}{dx}=3x^2+y$
$x\frac{dy}{dx}+1=0$
$\frac{d}{dx}4xsiny+3sin2y=2cosy\:$
$5y^4+25y^3-70y^2$
$9tan^2\left(x\right)=3$
$y=\left(x^6-1\right)^9$
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