Class IX

If cot 𝛒 = 1/(√2-1), then sin 𝛒 . cos 𝛒 is equal to
  1. 1
  2. (√3)/2
  3. 2/(√3)
  4. (√2)/4
If ABC has a right angle at 𝛒. If BC = √2 and AB=AC=1 ,then sin π˜‰ is equal to
  1. √2
  2. √3
  3. 1/(√2)
  4. (√3)/2
If sin𝛩=8/17 then the value of cos𝛩 and tan𝛩
  1. 15/17, 8/15
  2. 15/8, 8/15
  3. 15/17, 15/8
  4. None of these
If √2 sin(60⁰ -𝛳) =1, then the value of 𝛳 is
  1. 20⁰
  2. 30⁰
  3. 15⁰
  4. None of these
If √3 tan 2𝛳 -1 , then the angle 𝛳 is
  1. 30⁰
  2. 60⁰
  3. 90⁰
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