solve the eqution for x:
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we know that
tan~1 x = tan~1 x+y/1-xy
after completing the equation we find
2x^2-8x+8=0
so, x=2,-8
mark as brilliant
tan~1 x = tan~1 x+y/1-xy
after completing the equation we find
2x^2-8x+8=0
so, x=2,-8
mark as brilliant
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