A curve has equation y = 2/3 ln(1 + 3 cos2 x) for 0 ≤ x ≤ ½ 
(i) Express dy/dx in terms of tan x.
(ii) Hence find the x-coordinate of the point on the curve where the gradient is −1. Give your answer correct to 3 significant figures.
Solution:
Reference: PYQ - May/Jun 2017 Paper 33 Q5
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