Daeshabea Daeshabea

11-05-2017
Mathematics

contestada

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

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ghanami ghanami

11-05-2017

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

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