I have no idea how to work this problem using addition or subtraction theories (Worried)

(x-n) = -sin x

Thanks!

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- May 7th 2010, 04:10 PMpmacpaddition or subtraction for cofunction identity
I have no idea how to work this problem using addition or subtraction theories (Worried)

**(x-n) = -sin x**

Thanks! - May 7th 2010, 05:05 PMdwsmith
- May 7th 2010, 05:18 PMpmacp
Prove the confunction identity sin (x - π) = -sin x using the addition or subtraction formulas.

- May 7th 2010, 05:21 PMdwsmith
$\displaystyle sin(x-\pi)=sin(x)cos(\pi)-cos(x)sin(\pi)=-sin(x)$

- May 7th 2010, 05:25 PMpmacp
thank you!