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trigonometria

$sin(x) = sin(x + 2kpi)$
$sin(-x) = -sin(x)$
$sin(x) = cos(pi/2 - x)$
$cos(x) =cos(x + 2kpi)$
$cos(-x) =cos(x)$
$cos(x) = sin(pi/2-x)$
$tan(x) = tan(x + kpi)$
$tan(-x) = -tan(x)$
$tan(x) = cot(pi/2 - x)$
$cot(-x) = -cot(x)$

etc

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