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Question

The number of ordered pairs (x,y) satisfying the equation x2+2xsin(xy)+1=0 is
(where y[0,2π])

A
1
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B
2
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C
3
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D
0
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Solution

The correct option is B 2
Given:
x2+2xsin(xy)+1=0
(x+sin(xy))2+(1sin2(xy))=0(x+sin(xy))2+cos2(xy)=0
Which is possible only when both terms are individually equal to zero, so

x+sin(xy)=0 and cos2(xy)=0sin(xy)=x and sin(xy)=±1

Case 1:sin(xy)=1x=1,
sin(y)=1siny=1y=3π2

Case 2:sin(xy)=1x=1,
sin(y)=1siny=1y=3π2

Hence, there are 2 ordered pairs (1,3π2) and (1,3π2).

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