Thread: Prove the Following

1. Prove the Following

What is this question asking
Prove the following( I know it's asking me to proove something)
sin((pi/4)+x)-sin((pi/4)-x)= root(2sinx)+1.41sinx

2. Originally Posted by nightrider456
What is this question asking
Prove the following( I know it's asking me to proove something)
sin((pi/4)+x)-sin((pi/4)-x)= root(2sinx)+1.41sinx
use the sum/difference identity for sine ...

$\sin(a \pm b) = \sin{a}\cos{b} \pm \cos{a}\sin{b}$

you should get just $\sqrt{2}\sin{x}$ on the right side