If X = tan 40o, then the value of 2 tan 50o will be:
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Correct answer: A
Explanation
The correct answer is option 1 i.e 2/X
⇒ 2tan50o = 2tan(90o - 40o)
In the first quadrant, the tan angle is positive
⇒ 2tan(90o - 40o) = 2cot40o
⇒ 2tan(90o - 40o) = 2 / tan40o
⇒ 2tan(90o - 40o) = 2 / X