Calculate the value of A, if :
cos 3A (2 sin 2A - 1) = 0
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(tan A - 1) (cosec 3A - 1) = 0
(sec 2A - 1) (cosec 3A - 1) = 0
(cosec 2A - 2) (cot 3A - 1) = 0
If 2 sin x° - 1 = 0 and x° is an acute angle; find:
(i) sin x°
(ii) x°
(iii) cos x° and
(iv) tan x°.