Class IX

If cos 2𝔁 = cos 60Β° cos 30Β° + sin 60Β° sin 30Β° then the value of 𝔁
  1. 15Β°
  2. 40Β°
  3. 30Β°
  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 sin π˜‰ =1/2 , then 3cos π˜‰ - 4cosΒ³ π˜‰ is equal to
  1. 0
  2. 1
  3. 3/4
  4. 2(1/2)
If the ractangle ABCD , AB = 15 cm and ∠BAC = 60⁰ then the length of side BC is equal to
  1. 15 cm
  2. 15√2 cm
  3. 15√3 cm
  4. 15√5 cm
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
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