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For the equation 1-2x-x^2=tan^2(x+y)+cot...

For the equation `1-2x-x^2=tan^2(x+y)+cot^2(x+y)` (a)exactly one value of `x` exists (b)exactly two values of `x` exists (c)`y=-1+npi+pi/4,n in Z` (d)`y=1+npi+pi/4, n in Z`

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