a. Derive a formula for cos 3 in terms of sinand cos using Euler's formula. b. Derive
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a. Derive a formula for cos 3θ in terms of sinθand cosθ using Euler's formula.
b. Derive the formula cos 3θ = 4 cos3 θ - 3 cosθ from part (a) and the identity sin2 θ + cos2θ= 1.
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a Comparing these two expressions we see that cos 3 cos 3 3 ...View the full answer
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