To prove: the addition formula for Sine by using the addition and subtraction Formulas of Cosine and the co function identities.
Explanation of Solution
Use addition and subtraction formula for cosine and the co function identities.
Know that the addition formula for sine as
On using
On using the subtraction formula cosine as
On using
Thus, the addition formula for sine as
Chapter 7 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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