alleryStart learning →Expressing tan 2θ through tanθ alone yields
A2 tanθ / (1 − tan²θ)
B2 tanθ / (1 + tan²θ)
C(1 − tan²θ) / 2 tanθ
Dtanθ / (1 − 2 tan²θ)
Answer & Solution
Correct answer: A. 2 tanθ / (1 − tan²θ)
Putting A = B = θ in tan(A + B) gives 2tanθ/(1 − tan²θ).
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