Verify if this is an identity cot(-x) tanx=-1

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Hughesjmh · Answer 1 · 2018-05-31T18:42:47+0000

hello :
cot(-x) tan(x)=-1......(*)
* cot(x) = 1/tan(x)
cot(-x) = -cot(x)= -(1/tan(x))

cot(-x) tan(x) = -(1/tan(x))×tan(x)=-1