Class X

A.M between 1-x+x² and 1+x-x² is
  1. 4
  2. 3
  3. 2
  4. 1
If an+2 + bn+2/an+1 + bn+1 is arithmetic mean between a and b, then n =
  1. −1
  2. 1
  3. -2
  4. 0
 Sin(π/2-α) =
  1. cosecα
  2. cosα
  3. −cosα
  4. −sinα
 If 4x is side length of square then area of region is
  1. (4-π)x²
  2. 2(4-π)x²
  3. 3(4-π)x²
  4. 4(4-π)x²
1° =
  1. 1 radian
  2. 0.01745 radian
  3. 0.5 radian
  4. 2.5 radian
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