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AP EAMCET202120 Aug 2021Morning ShiftMathematicsTrigonometric EquationsActual

If sin π 4 cot θ = cos π 4 tan θ , then θ =

Options

  1. A2 n π + π 4
  2. B2 n π ± π 4
  3. C2 n π - π 4
  4. Dn π + π 4

Correct answer

D. n π + π 4

Step-by-step solution

Given sin π 4 cotθ = cos π 4 tanθ Using sin π 2 - θ = cos θ , ⇒ sin π 4 cotθ = sin π 2 - π 4 tanθ ⇒ π 4 cotθ = π 2 - π 4 tanθ ⇒ π 4 tanθ + cotθ = π 2 ⇒ tanθ + cotθ = 2 ⇒ sin θ cos θ + cos θ sin θ = 2 ⇒ sin 2 θ + cos 2 θ cos θ sin θ = 2 ⇒ 1 sinθcosθ = 2 ⇒ 2 sinθcosθ = 1 Using 2 sinθcosθ

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