railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If tan (α + β) = a, tan (α - β) = b, then the value of tan 2α is :
1
\(\rm \frac{a+b}{1-ab}\)
2
\(\rm \frac{a+b}{1+ab}\)
3
\(\rm \frac{a-b}{1+ab}\)
4
\(\rm \frac{a-b}{1-ab}\)