Question

Use sum and difference identities to find the exact value of sin 75 degrees. If someone could walk me through it that would be great. I have the equation but I don't know if im doing it right.

Answer 1

sin 75 =sin(60 +15)=sin60cos15=cos60sin15
further sin15=sin(45-30)
cos15=cos(45-30)

Answer 2

what have you tried? that way we can tell if you are doing it right or not :)

Answer 3

Um well im not really sure these pictures are all they have given me on how to do this.