Evaluate each expression. Express your answers as simplified fractions and rationalize the denominator, if possible. cos 45° cos 45° - sin 45° sin 45° =

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Part 3/4 

Part 2 of 4
(b) Expand cos (2.45°) = cos (45° +45°) using the sum formula for cosine. Do not simplify your answer.
cos (45° +45°) = 0°
Part: 2/4
Part 3 of 4
2
Evaluate each expression. Express your answers as simplified fractions and rationalize the denominator, if
possible.
cos 45° cos 45º – sin 45° sin 45°
-0 0.0
Transcribed Image Text:Part 2 of 4 (b) Expand cos (2.45°) = cos (45° +45°) using the sum formula for cosine. Do not simplify your answer. cos (45° +45°) = 0° Part: 2/4 Part 3 of 4 2 Evaluate each expression. Express your answers as simplified fractions and rationalize the denominator, if possible. cos 45° cos 45º – sin 45° sin 45° -0 0.0
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