$fy=\log_{3}\left(27\right)$
$\lim_{x\to infinity}\left(\frac{4^x+2^x}{6^x}\right)$
$\left(sec\:x\:-\:tan\:x\right)\left(csc\:x\:+\:1\right)\:$
$2-2\cos^2a$
$10x^2-13x-3$
$\left(5x+4\right)\left(5x+3\right)$
$\frac{dy}{dx}=8x\sqrt{y}$
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