Prove the given identities. cos(x y) cos y sin(x y) sin y = cos
Question:
Prove the given identities.
cos(x − y) cos y − sin(x − y) sin y = cos x
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To prove the identity we will use the following trigonometric identities cosa b cos a cos b sin a si...View the full answer
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Related Book For 
Basic Technical Mathematics
ISBN: 9780137529896
12th Edition
Authors: Allyn J. Washington, Richard Evans
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