find the exact value of each expression. do not use a calculator 9) cos(75 degrees) cos(15 degrees) 11) cos(157.5 degrees) sin(22.5 degrees)

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter2: Exponential, Logarithmic, And Trigonometric Functions
Section2.CR: Chapter 2 Review
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find the exact value of each expression. do not use a calculator

9) cos(75 degrees) cos(15 degrees)

11) cos(157.5 degrees) sin(22.5 degrees)

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