$2\cdot\cot^2\left(x\right)\cdot\cos\left(3\cdot x\right)-\csc^2\left(x\right)+1=0$
$x^2+5x-66$
$-\left(9x-11y-69\right)$
$x+3+3x^2-3x+6$
$y'\:+2ty=3t$
$100-\left(25x-10\right)-\left(100-25x\right)-10$
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