8) Write the expression -3sinx + 4cosx in the form ksin(x + a) for 0 < a < 2. Round a to three decimals.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.6: Additional Trigonometric Graphs
Problem 84E
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Question 8
the identity
cos(A+B) cos(AB) = cos²A + cos²B - 1
8) Write the expression-3sinx + 4cosx in the form ksin(x + a) for 0 ≤ a < 2. Round a to three decimals.
9) Verify the identity
sin20
1-cos20
cote
Transcribed Image Text:the identity cos(A+B) cos(AB) = cos²A + cos²B - 1 8) Write the expression-3sinx + 4cosx in the form ksin(x + a) for 0 ≤ a < 2. Round a to three decimals. 9) Verify the identity sin20 1-cos20 cote
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