If tan 4A = cot (A – 20o), 0o < θ < 90o, then the value of A is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e 22o.
| Understanding/Application |
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tan4A = cot(A -20) , 0o < 4A < 90o cot(90o - 4A) = cot(A - 20o) 90o - 4A = A - 20o |
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5A = 110o A = 22o |