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2 | Proof(s)
## Example 6--Page 2We want .
Looking at the right side we want to get
from the left side. We know by the Product
to Sum formulas, Since . Now for the second factor, we still
didn't reach the goal ,
and cancel .
But we see it is simpler than the last step. Same idea, we want
.
It looks like the Sum to Product
formulas. If we use the Sum
to Product formula of The identity has been proven. This problem is a little bit more difficult than the previous ones. You can see that Derived formulas are very useful for actual angle identities. |
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