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 cos2 x – 1
b. cos2 x – sin2 x = 1 – 2 sin2 x
c. cos4 x + sin2 x cos2 x = cos2 x
d. 2(1 + cos x) – (1 + cos x)2 = sin2 x
e. 2 – (sin x + cos x)2 = (sin x – cos x)2
f. cos4 x + sin2 x = sin4 x + cos2 x
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a We can start by using the identity cosx 1 sinx cosx sinx ...View the full answer
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Related Book For
Cambridge IGCSE And O Level Additional Mathematics Coursebook
ISBN: 9781108411660
2nd Edition
Authors: Sue Pemberton
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