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Find all the values of x such that (i) -6π ≤ x ≤ 6π and cos x = 0(ii) -5π ≤ x ≤ 5π and cos x = 1 |
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Answer» (i) cos x = 0 ⇒ x = (2n + 1) ± π/2 n = 0, ±1, ±2, ±3, ±4, ±5 (ii) cos x = 1 = cos 0 ⇒ x = 2nπ ± 0 n = 0, ±1, ±2 |
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