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If cos x = cos α, then for integer n the general solution is which one?
Ax = nπ + (-1)ⁿα
Bx = 2nπ ± α
Cx = nπ + α
Dx = nπ ± α
Answer & Solution
Correct answer: B. x = 2nπ ± α
Cosine is even and has period 2π, so equal cosines give x = α or x = -α plus any multiple of 2π.
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