$\left(3-x\right)\log_k=-2$
$\left(sin\:2a\:+\:cos\:2a\right)^2\:-\:1\:=\:sin4a$
$ax-ay$
$\left(u+23\right)\left(u-1\right)$
$\left(x^2\frac{1}{x^2}\right)$
$ax+4a+a+4x^2+6ax-5$
$tan\left(x\right)cos\left(x\right)-sin^2\left(x\right)csc\left(x\right)$
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