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Question

sin3xsin3(600x)+sin3(1200+x)
[m4,m4]m=

A
1
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B
3
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C
1
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D
4
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Solution

The correct option is B 3
Let f(x)=sin3xsin3(60o+x)+sin(120o+x)
=sin3xsin(π+3x)+sin(2π+3x)
=sin3x+sin3x+sin3x
=3sin3x
range of f(x)ϵ[3,3]
range of sinxϵ[1,1]

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