[IMG]file:///C:/DOCUME%7E1/Asus/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG]Cotx - tanx = 2cot2x

please help

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- March 19th 2009, 08:54 PMmanutd4lifetrigonometry Prove indentity
[IMG]file:///C:/DOCUME%7E1/Asus/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG]Cotx - tanx = 2cot2x

please help - March 20th 2009, 12:04 AMProve It
You need to know that

and

.

These are proved using the sum formulas (which are proven here)

Proof of the sum and difference formulas.

Trigonometric identities

. - March 20th 2009, 12:47 AMmanutd4life
- March 20th 2009, 01:00 AMProve It
- March 20th 2009, 01:02 AMmanutd4life
Thank you very much