a) Prove the identity cos 4 sin 4 = 2 cos 1. b)
Question:
a) Prove the identity cos4 θ − sin4 θ = 2 cos²θ − 1.
b) Solve the equation cos4 θ − sin4 θ = 0 for 0° ≤ θ ≤ 360°.
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a We can use the identity cos sin 1 to write cos4 sin4 cos sincos sin cos cos sin ...View the full answer
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Related Book For
Complete Pure Mathematics 1 For Cambridge International AS & A Level
ISBN: 9780198427438
2nd Edition
Authors: Jean Linsky, Brian Western, James Nicholson
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