$54\cdot73$
$\lim_{x\to-1}\left(x^2+9x+1\right)$
$\frac{tan\:\:\left(\:\theta\:\right)\:\:}{\sin\:\left(\:\theta\:\right)\:}\:=\:sec\:\left(\:\theta\:\right)$
$1\:-\:\left(\frac{13}{7}-\frac{120}{7b}\right)^2$
$\lim_{x\to0}\left(\frac{\left(\sqrt{1+6x}-1\right)}{x^2}\right)$
$\sin^2x=7\sin x$
$4+x>5-2x$
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