$\tan\left(x\right)=0.6697$
$\frac{d^2}{dx^2}\left(x^2-4y^2=4\right)$
$-4x^2-x^2-6x^2-4x^2$
$12.56x^3+120x$
$-16\cdot4$
$7\:-\:8c\:+\:3\:-\:6c$
$4x^2-8x-3=0$
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