Find the quadrants of the coordinate pla...

Find the quadrants of the coordinate planes such that for each point `(x,y)` on these quadrants ( where ` x ne 0 , y ne 0`) , the equation, ` (sin^(4) theta )/x + ( cos^4 theta)/( y)=(1)/(x+y) ` is soluble for ` theta ` .

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The correct Answer is:

`rArr` x and y must be same sign, which is true in ist and 3rd quadrant only.

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