Q.

sinθsin(60°−θ)sin(60°+θ)∈[−k,k]⇒k=

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a

12

b

13

c

14

d

34

answer is C.

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Detailed Solution

If f(θ)=sinθsin(α−θ)sin(α+θ)=14sin3θ for α=60°,120°,240°,300° range is [−14,14]
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