Thread: Cosine/Sine

Hey guys Im new here and I am hoping I can get some help.

write the following as a product of sine and/or cosine of the angles sin (B+C-a) + sin (C+A-B) + sin (A+B-c)-sin (A+B+C)

Originally Posted by ChrisBosh

Hey guys Im new here and I am hoping I can get some help.

write the following as a product of sine and/or cosine of the angles sin (B+C-a) + sin (C+A-B) + sin (A+B-c)-sin (A+B+C)

just apply the addition formula for sine (and cosine) over and over

Recall:

and

Now, you have three terms in the sum for the angles. just apply the rules two at a time


example:

and then you can apply the formulas i mentioned on and

Originally Posted by Jhevon

just apply the addition formula for sine (and cosine) over and over

Recall:

and

Now, you have three terms in the sum for the angles. just apply the rules two at a time


example:

and then you can apply the formulas i mentioned on and

thank you so much man. really appreciate it. i remember this now.

o yes and reps added