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The general solution of the equation 7 cos² x + 3 sin² x = 4 is

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If tan px – tan qx = 0, then the values of θ form a series in

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If a is any real number, the number of roots of cot x – tan x = a in the first quadrant is (are).

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A solution of the equation cos² x + sin x + 1 = 0, lies in the interval

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The number of solution in [0, π/2] of the equation cos 3x tan 5x = sin 7x is