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Find A, if 0° ≤ A ≤ 90° and (i) 2cos2 A - 1 = 0, (ii) sin 3A − 1 = 0

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Find A, if 0° ≤ A ≤ 90° and 

(i) 2cos2 A - 1 = 0,

(ii) sin 3A − 1 = 0

(iii) 4sin2 A - 3 = 0

(iv) cos2 A - cosA = 0

(v) 2cos2 A + cosA - 1 = 0

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(i) 2cos2 A - 1 = 0,

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