Q29 of 104 Page 204

If tan5θ ⋅ tan4θ = 1, θ is ____

tan5θ.cot(90–4θ) = 1


⇒ cot(90–4θ) = tan5θ.


⇒ 5θ = 90– 4θ


⇒ θ = 10

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