Prove each of these identities. a. cos 2 x sin 2 x 2 cos 2
Question:
Prove each of these identities.
a. cos2 x − sin2 x ≡ 2 cos2x − 1
b. cos2x − sin2x ≡ 1 − 2 sin2x
c. tan2x − sin2x ≡ tan2 x sin2x
d. cos4x + sin2x ≡ sin4 x + cos2x
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a cos2 x sin2 x 2 cos2 x 1 Starting with the lefthand side cos2 x sin2 x cos2 x 1 cos2 x 2 cos2 x 1 ...View the full answer
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Related Book For 
Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook
ISBN: 9781108407144
1st Edition
Authors: Sue Pemberton, Julian Gilbey
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