Class IX

If sec α =5/4 , then tan α / (1+ tan ² α) is equal to
  1. 3/4
  2. 9/25
  3. 12/25
  4. 1/25
If ABC has a right angle at 𝛢. If BC = √2 and AB=AC=1 ,then sin 𝘉 is equal to
  1. √2
  2. √3
  3. 1/(√2)
  4. (√3)/2
If √2 sin(60⁰ -𝛳) =1, then the value of 𝛳 is
  1. 20⁰
  2. 30⁰
  3. 15⁰
  4. None of these
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 √3 tan 2𝛳 -1 , then the angle 𝛳 is
  1. 30⁰
  2. 60⁰
  3. 90⁰
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