$25\cdot1cm^2$
$\sec^2a+\tan^2a$
$\cos\left(sin^{-1}x+cos^{-1}y\right)$
$\int\:\frac{8x+1}{\sqrt{16-x^2}}dx$
$\lim_{x\to-12}\left(\frac{x^2-144}{x+12}\right)$
$x^2-7x+12=0$
$-2\left(-7+\right)+53$
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