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Question

16r=11+cos4r=


  1. 42 cos1 cos2 cos17

  2. 42 cos1 sin2 cos17

  3. 42 sin1 cos2 cos17

  4. None of these


Solution

The correct option is D

None of these


16r=11+cos4r=16r=12cos2r

=2(cos2+cos4+cos6++cos32)

=2sin16sin1cos{2+(15)(1)}=2sin16cos17sin1

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