If (21 cos A + 3 sin A) / (3 cos A + 4 sin A) = 2, then find the value of cot A.

2023

If (21 cos A + 3 sin A) / (3 cos A + 4 sin A) = 2, then find the value of cot A.

  1. A.

    9/11

  2. B.

    11/9

  3. C.

    1/3

  4. D.

    11/10

Attempted by 1 students.

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Correct answer: C

From (21 cos A + 3 sin A)/(3 cos A + 4 sin A) = 2, we get 21 cos A + 3 sin A = 6 cos A + 8 sin A. Hence 15 cos A = 5 sin A, so tan A = 3 and cot A = 1/3.

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