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Question

Let Fn(θ)=nk=014Ksin4(2kθ), then which of the following is true

A
F2(π4)=12
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B
F3(π8)=2+24
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C
F4(3π2)=1
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D
F5(π)=1
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Solution

The correct option is C F4(3π2)=1
Fn(θ)=sin4θ+sin42θ4+sin4(22θ)42+sin4(23θ)43........
F2(π4)=14+14=12
F3(π8)=(222)4+116+116=224
F4(3π2)=1+0=1
F5(π)=0

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