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Question

If x+y=2π3 and sinxsiny=2 , then

A
the number of values of x[0,4π] are 4
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B
the number of values of x[0,4π] are 2
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C
the number of values of y[0,4π] are 4
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D
the number of values of y[0,4π] are 8
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Solution

The correct options are
A the number of values of x[0,4π] are 4
C the number of values of y[0,4π] are 4
x+y=2π3y=2π3x
sinx=2sin(2π3x)
sinx=2[(32)cosx+12sinx]sinx=3cosx+sinxcosx=0x=(2n+1)π2, nZ
y=2π3nππ2
y=π6nπ, nZ

Hence, for x[0,4π],
x=π2,3π2,5π2,7π2

and for y[0,4π],
y=π6,7π6,13π6,19π6

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