Concept explainers
To prove:The trigonometric expression

Explanation of Solution
Given information:
The given trigonometric expression is
Formula Used:
Use the sum to products formulas.
Proof:
Consider theleft hand side of the equation and simplify it.
Solve above equation.
Cancel the common terms.
Using the quotient identity.
In this problem graphing utility can’t be used to verify the identity as the equation of both sides contains two variables.
Hence, the result is true.
Chapter 5 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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