$cot^2a\:\left(sec^2a-1\right)=1$
$4a+3a+2a-9a$
$ycscx\cdot xcosx$
$\left(x+4y\right)^2-\left(3x-2\right)\left(3x+2\right)$
$48a^5b+36ab^3$
$6x^2+7x-10=0$
$x^4+16>0$
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