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The value of tan81° – tan63° – tan27° + tan9° is

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Consider the conic ex^2 + y^2 2e^2x 2^2y + e^3 + 3 = e. Suppose P is any point on the conic and S1, S2 are the foci of the conic, then the maximum value of (PS1 + PS2) is The value of tan9° – tan27° – tan63° + tan81° is