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If cos a + cos b = a, sin a + sin b = b and q is the arithmetic mean between a and b , then sin 2q + cos 2q is equal to
  • a)
    (a+b)2 / (a2 +b2)
  • b)
    (a-b)2 / (a2 +b2)
  • c)
  • d)
    none
Correct answer is option 'D'. Can you explain this answer?
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