Using the Value of a Trigonometric Function In Exercises 83 and 84, use the value of the trigonometric function to evaluate the indicated functions.
(a)
(b)
(a)
To calculate: The value of the trigonometric function
Given Information:
The value of
Formula used:
Sum and Differences formulas:
Calculation:
Consider trigonometric function is
Apply difference formulas in the above function as,
Substitute the value of
(b)
To calculate: The value of the trigonometric function
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