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Question

16r=11+cos4r=


A

42 sin1 cos2 cos17

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B

42 cos1 cos2 cos17

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C

42 cos1 sin2 cos17

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D

None of these

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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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