$a^2x-2a^2y-ax^2+2axy\:$
$778+-158$
$2cos^2\left(x\right)=sec^2\left(x\right)-tan^2\left(x\right)$
$y'-2xy=2x$
$\frac{25bc}{40abc}$
$-3e^xtan\left(y\right)dx=\left(2-e^x\right)sec^2\left(y\right)dy$
$\cos x=3\cos x-2$
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