$\sin^2\left(x\right)-2\sin\left(x\right)=1$
$x^4+5x^3-3x-15$
$\left(3x^2+5x-4\right)^2$
$5\left(2\right)+4\left(1\right)$
$4x^2+x+8$
$x^2-9x^2+16$
$\frac{dy}{dx}x+2y=e^{x^2}$
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