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VishalPosted: Sat 12 March 2016
17 Mar 2016 04:54
Gold Medalist in B.Sc., IIT Kanpur Alumini , PhD. Maths, 4+ years experience with BE students
Answer is 1. Hint: Use formula of tan (A+B) to find out tan A tan B. Take tan 10 and tan 80 together and tan 20 and tan 70 together.
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