
Concept explainers
To explain: The given

Explanation of Solution
Given information:
The given trigonometric identity is
Formula used:
Trigonometric function,
Calculation:
Consider the function,
Recall that
From the figure
Hypotenuse is c, base is b and perpendicular is a.
In a right angle triangle
Rewrite the left hand side of the equation as,
Rewrite the right hand side of the equation as,
Thus, left hand side and right hand side is equal, therefore, the trigonometric identity
Chapter 5 Solutions
Precalculus with Limits
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