The no of pairs (x,y) satisfy the equation sinx + siny = sin(x+y) and |x|+|y|=1 is
option
a) 2
b) 6
c) 4
d) infinite

• The line y = -x, which bisects the second and fourth quadrants, is
  clearly a solution line: sin(x + (-x)) = 0 and sin x + sin(-x) = 0.
  2nd eqn satisfies when x=-0.5,y=0.5 & x=0.5,y=-0.5
  ans is 2
• 10 years agoHelpfull: Yes(1) No(0)