Answered: Determine sin(A - B) given sin A = 4/5…

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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Hello,

I am trying to undertand this question from my lecture. I am attaching an image with the excersice and solution. However, I am unsure of how to get the missing information (cosAsinB). We are using this:

sin(A-B)= sinAcosB - cosAsinB

The exercise provides Sin A and cos B, so how do I get the others?

Thank you!

Determine sin(A - B) given sin A = 4/5 in quad Il and
cos B = -5/13 in quad III.
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