If sin(3θ + α) + sin(3θ − α) + sin(α − θ)
− sin(α + θ) = cosα and cosα ≠ 0, then
which of the values of θ does not satisfy
the given equation?
(1) nπ + (−1)^n (π/6), n ∈ I
(2) nπ + (−1)^n (π/(10)), n ∈ I
(3) nπ + (−1)^n (π/5), n ∈ I
(4) nπ − (−1)^n ((3π)/(10)), n ∈ I
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