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Function f(x) = (λsinx + 6cosx)/(2sinx + 3cosx) is monotonically increasing, if

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Function f(x) = (λsinx + 6cosx)/(2sinx + 3cosx) is monotonically increasing, if

(A)  λ > 1

(B) λ < 1

(C) λ < 4

(D) λ > 4

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Answer is (D) λ > 4

The function is monotonically increasing if

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