$\lim_{x\to0}\left(\frac{7\:in\left(2x\right)}{in\left(x\right)}\right)$
$-\cos^{2}a=\frac{\cosa}{\seca}$
$cosx+1=\frac{5}{4}$
$\sqrt[3]{-1.000}$
$3\tan^2x=12$
$x^2=16-xy^2$
$2\cos^2t+\:3\:\cos t+1=0$
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