Question #1e265
2 Answers
Please see below.
Explanation:
.
We have a Sum to Product formula that says:
Therefore:
See below
Explanation:
In order to complete this proof, you need to know the angle addition/subtraction formulas for sine:
Using these formulas for y1 and y2 we get:
Distribute the 20:
Distribute the 20
Therefore:
It's all about the addition/subtraction formulas!