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

please help

Printable View

- Mar 19th 2009, 09:54 PMmanutd4lifetrigonometry Prove indentity
[IMG]file:///C:/DOCUME%7E1/Asus/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG]Cotx - tanx = 2cot2x

please help - Mar 20th 2009, 01:04 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

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