Simplify $cot(-x) sinx$ ?

Oct 31, 2017

$cot(-x) sinx -= -cos(x)$

We have:

$cot(-x) sinx -= cos(-x)/sin(-x) sinx$
$" " = cos(x)/(-sin(x)) sinx$
$" " = cos(x)/(-1)$
$" " = -cos(x)$

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Simplify cot(-x) sinx cot(-x) sinx ?