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I should know this, But erk.

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

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

Sorry. I don't understand....

sincos sincos
cos cos sin sin??

Oh.

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

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

Er, I still don't understand...

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

In that, I break both of them up?

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

I think I m suppose to keep it in radians.

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

i changed my picture