Pre-Calculus Workbook For Dummies by Mary Jane Sterling

Author:Mary Jane Sterling [Sterling, Mary Jane]
Language: eng
Format: epub
ISBN: 9781119508823
Publisher: Wiley
Published: 2019-03-26T00:00:00+00:00

This comes out to be approximately 0.99.

17 Express as a sum or difference. The answer is .

Since you see cosine times cosine, rewrite using the product-to-sum identity . In this case

18 Express as a sum or difference. The answer is .

Begin by plugging into the appropriate product-to-sum identity: .

Then simplify: .

19 Express as a sum or difference. The answer is .

Again, plug in the appropriate product-to-sum identity: . Then simplify: .

20 Express as a sum or difference. The answer is .

You guessed it! Plug in the appropriate product-to-sum identity: .

Simplify: .

21 Find . The answer is .

Begin by using the sum-to-product identity to rewrite the expression: . Simplify the result using unit circle values:

22 Find . The answer is .

Use the sum-to-product identity to rewrite the expression: . Then, plug in the values and simplify:

23 Find . The answer is .

Rewrite the expression with the appropriate sum-to-product identity:

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