Trigonometric EquationHard

Question

The general solution of the equation 7 cos2 x + sin x cos x − 3 = 0 is given by-

Options

A.nπ + (n ∈ I)   
B.nπ − (n ∈ I)   
C.nπ + tan-1 (n ∈ I)   
D.nπ − kπ + tan-1 (n ∈ I)   

Solution

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