## anonymous one year ago cos(x)-sin(x)=sqrt(2)sin(x) prove that: cos(x)+sin(x)=sqrt(2)cos(x)

1. anonymous

is this the question $\cos(x)-\sin(x)= \sqrt2 sinx$ prove $cosx+sinx = \sqrt2 cosx$

2. anonymous

Yes

3. anonymous

Any specific way you need to prove?

4. anonymous

No

5. UsukiDoll

I'm confused . That could be $\sqrt{2}sinx$or $\sqrt{2sinx}$ :/

6. anonymous

$\sqrt{2} sinx$

7. UsukiDoll

alright... there's got to be an identity we can use for this

8. anonymous

don't no ... i'm also confused