In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression. 1. sin

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In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression.
1. sin 75° + sin 15°
2. cos 120° + cos 60°
3. cos 3π / 4 - cos π / 4
4. sin 5π / 4 - sin 3π / 4

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Algebra and Trigonometry

ISBN: 978-1337271172

10th edition

Authors: Ron Larson

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Question Posted: Feb 14, 2018 03:22 AM

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In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression. 1. sin

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1 sin 75 o sin 15 o 2 sin75 o 15 o 2 cos75 o 15 o 2 2 sin 45 ...View the full answer

Algebra and Trigonometry

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