If tan A + sec A = 3, find tan A.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e.
tan A + sec A = 3
(sec A + tan A)(sec A − tan A) = 1
sec A − tan A = 1/3
(sec A + tan A) + (sec A − tan A) = 3 + 1/3
2 sec A = 10/3
sec A = 5/3
tan A = 3 − sec A = 3 − 5/3 = 4/3