
To prove:The trigonometric expression

Explanation of Solution
Given information:
The given trigonometric expression is
Formula Used:
Use the formula
Proof:
Consider theleft hand side of the equation and simplify it.
From the above, it is clear thatone side of the equation can be transformed into other side of the equation.
Check result by using graphing utility.
Start the graphing calculator.
Make sure that the calculator is in the radians mode.
Press
To insert
Adjust the window setting: press
Press
The above graph appears to coincide, the given equation appears to be an identity.
Hence, the result is true.
Chapter 5 Solutions
Precalculus with Limits: A Graphing Approach
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