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Find all x satisfying cos 3x = 0.
Ax = (2n+1)π/3, n ∈ Z
Bx = (2n+1)π/6, n ∈ Z
Cx = nπ/3, n ∈ Z
Dx = (2n+1)π/2, n ∈ Z
Answer & Solution
Correct answer: B. x = (2n+1)π/6, n ∈ Z
cos 3x = 0 needs 3x = (2n+1)π/2, so x = (2n+1)π/6.
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