Mathematics (AS & A Level) · Oct / Nov 2017 · Paper 31 · Question 6
9709
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The variables x and y satisfy the differential equation dy dx = 4 cos2y tan x, for 0 ≤x < 1 20, and x = 0 when y = 1 40. Solve this differential equation and find the value of x when y = 1 30. [8] 11
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