Kendra has $32 and is planning to save $25 each week. She is saving to buy a new phone that costs $257.00. Write an equation to
1 answer:
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Given:
To find:
The exact value of cos 15°.
Solution:
Using half-angle identity:
Using the trigonometric identity:
Let us first solve the fraction in the numerator.
Using fraction rule:
Apply radical rule:
Using :