2 tan⁻¹ A = ?
- 2A/(1−A)
- 2A/(1+A²)
- 2A/(1−A²)
- None of these
Explanation
Using the double angle identity:
tan 2θ = 2 tan θ / (1 − tan² θ)
If tan θ = A, then tan 2θ = 2A/(1−A²).
Last verified on 17-06-2026
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