Are there identities for inverse tangent?

Can you verify them [the identities] for me?

I know two of them:

arctan(x)=arccot(1/x)

arctan(x)=pi/2-arccot(x)

What is the third one if the identity exist? And Why?

Thank you in advance.

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- May 26th 2012, 03:18 PMCbarker1Are there identities for inverse tangent?
Are there identities for inverse tangent?

Can you verify them [the identities] for me?

I know two of them:

arctan(x)=arccot(1/x)

arctan(x)=pi/2-arccot(x)

What is the third one if the identity exist? And Why?

Thank you in advance. - May 26th 2012, 03:55 PMskeeterRe: Are there identities for inverse tangent?
- May 26th 2012, 09:18 PMProve ItRe: Are there identities for inverse tangent?
- May 27th 2012, 09:46 AMCbarker1Re: Are there identities for inverse tangent?
why there is a pi-arctan(x)=arctan(x)+arctan(x/2)