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Answer to Question #14926 in Trigonometry for MMubin

Question #14926
Given that cos a = -12/3 and a is an angle in Quadrant II and that sin Beta = 3/5 is an angle in Quadrant I. Determine

a) cos (a + Beta)

b) sin (Beta - a)
Expert's answer
Dear visitor
The statement of your question is confusing: cosine's value can't be less than -1. Cosine is bounded function with
values between -1 and 1. In Real Analysis.

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