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  1. If cos 20° = m and cos 70° = n, then the value of m2 + n2 is
    1. 1
    2. 3
      2
    3. 1
      √3
    4. 1
      2
Correct Option: A

cos 20° = m and cos 70° = n
∴ m2 + n2 = cos2 20°+ cos2 70°
= cos2 (90° – 70°) + cos2 70°
⇒ sin2 70° + cos2 70° = 1


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