IF anyone is still awake: sin(7pi/12)+cos(pi/12)

Question

nottim · Answer

I should know this, But erk.

anonymous · Answer

7pi/12*180/pi        pi/12*180/pi
cos 15 + sin 105

nottim · Answer

Oops. Sorry. I did not clarify:
Simplify the following. the final answer must be exact. However, it isn't necessary to rationalize the denominator.

anonymous · Answer

use angle identites for cos (45-30) and sin (60+45)

nottim · Answer

Sorry. I don't understand....

anonymous · Answer

sincos sincos 
cos cos sin sin??

nottim · Answer

Oh.

anonymous · Answer

NotHello NotTim,

sin(7pi/12) + cos(pi/12)

cos(pi/2 + pi/12) + cos (pi/2)

anonymous · Answer

NotSorry,

sin(pi/2 + pi/12) + cos(pi/2)

nottim · Answer

Er, I still don't understand...

nottim · Answer

Wait. So am I doing the addition formula for both of them?

nottim · Answer

In that, I break both of them up?

anonymous · Answer

Don;t do it my way, it's only gonna make it more complicated I thought I would be able to reduce it to Zero but Zero isn't the answer...


shinigam1m is right!

anonymous · Answer

sin(105) + cos(15)
sin(60 + 45) + cos(45 - 30)
sin60cos45 + sin45cos60 + cos45cos30 + sin45sin30

nottim · Answer

I think I m suppose to keep it in radians.

anonymous · Answer

keep it in radians then 45 = pi/4, 60 = pi/3 and 30=pi/6

anonymous · Answer

i changed my picture