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AP EAMCET20224 Jul 2022Morning ShiftMathematicsTrigonometric Ratios & IdentitiesActual

sin θ 1 - cot θ + cos θ 1 - tan θ =

Options

  1. A0
  2. B1
  3. Ccos θ - sin θ
  4. Dcos θ + sin θ

Correct answer

D. cos θ + sin θ

Step-by-step solution

sin θ 1 - cot θ + cos θ 1 - tan θ = sin θ 1 - cos θ sin θ + cos θ 1 - sin θ cos θ = sin 2 θ sin θ - cos θ + cos 2 θ cos θ - sin θ = sin 2 θ sin θ - cos θ - cos 2 θ sin θ - cos θ = sin 2 θ - cos 2 θ sin θ - cos θ = ( sin θ + cos θ ) ( sin θ - cos θ ) ( sin θ - cos θ ) = sin θ + cos θ .

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