$sec\:a\:csc\:^2a\:-cot^2a$
$7-3\cdot1$
$1+8c+16^2$
$-2a+-6+4a$
$\frac{dx}{dy}=y+x$
$\frac{1}{x-2}+\frac{1}{x-3}=1$
$\int\frac{2x+1}{3x^2-2x-1}dx$
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