number of pairs

The number of pairs of (x,y) satisfying the equation sinx+siny=sin(x+y) and lxl+lyl=1 is ?

2 Answers

hint first take the case when you are in the first quadrant..

then sin x + sin (1-x) = sin 1

the number of solutions of this will be? ??

Now figure out the remaining part of this solution [1]

Thank you :-)

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