Question

Exact Value:
cos(π/12)

Answer 1

I've started heading in the direction of cos(180/12) but I am not sure what is the best way to break this down.

Answer 2

cos(180/12) = cos(15)

Answer 3

ya u can do in this way

Answer 4

\[\cos15=\cos(45-30)=\cos45\cos30+\sin45\sin30\]

Answer 5

Okay I see what you did

Answer 6

Difference Identity Formula for cos

Answer 7

\[=(1/\sqrt{2})(\sqrt{3}/2)+(1/\sqrt{2})(1/2)\]

Answer 8

\[(\sqrt{3}/2\sqrt{2})+(1/2\sqrt{2})\]

Answer 9

\[(\sqrt{3}+1)/2\sqrt{2}\]

Answer 10

@shamim we don't just give out answers. We teach and guide the student to the correct answer.

Answer 11

ok

Answer 12

did u get my solution

Answer 13

@calculusfunctions I wasn't even paying attention after I knew which formula to use lol

Answer 14

I got:

Answer 15

thanks a lot

Answer 16

\[\frac{ √(2+√3) }{ 2 }\]

Answer 17

(No offense intended @shamim )