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If y=(x^4-x^2+1)/(x^2+sqrt(3)x+1)a n d(d...

If `y=(x^4-x^2+1)/(x^2+sqrt(3)x+1)a n d(dy)/(dx)=a x+b ,` then the value of a-b is (a)`cot(pi/8)` (b) `cot(pi/12)` (c) `tan((5pi)/12)` (d) `tan((5pi)/8)`

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