?For the following exercises, find the requested information.Given that \(\sin
Chapter 9, Problem 20(choose chapter or problem)
For the following exercises, find the requested information.
Given that \(\sin a=\frac{2}{3}\) and \(\cos b=-\frac{1}{4}\) , with a and b both in the interval \(\left[\frac{\pi}{2}, \pi\right)\), find sin(a + b) and cos(a − b).
Text Transcription:
sin a = 2/3
cos b = -1/4
[π/2, π)
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