$tan2x-1=0$
$\int csc\frac{2}{3}xdx$
$18+9+9x-3$
$2x\sqrt{x}2+4$
$\int\:\:sec^6\:acos2\:ad\:a$
$-x^3+3x^2-4$
$-\frac{7}{1}$
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