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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