Question

what is the exact value of sine 15 degrees and cosine 15 degrees

Answer 1

http://www.cut-the-knot.org/pythagoras/cos15.shtml

Answer 2

\[\sin(15^{o})=\frac{ \sqrt{6}-\sqrt{2} }{ 4 }\]

Answer 3

\[\cos(15^{0})=\frac{ \sqrt{6}+\sqrt{2} }{ 4 }\]

Answer 4

@donny471, don't just give the answer.
1. Explain the process
2. Provide general formulas
3. Provide steps whenever possible
4. Include the user in the answering process.

Answer 5

thanks guys but I would like to know how and why it is the answer. Please explain

Answer 6

Do you know how to use the unit circle?