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The abscissas of point Pa n dQ on the cu...

The abscissas of point `Pa n dQ` on the curve `y=e^x+e^(-x)` such that tangents at `Pa n dQ` make `60^0` with the x-axis are. `(a)1n((sqrt(3)+sqrt(7))/7)a n d1n((sqrt(3)+sqrt(5))/2)` `(b)1n((sqrt(3)+sqrt(7))/2)` `(c)1n((sqrt(7)-sqrt(3))/2)` `(d)+-1n((sqrt(3)+sqrt(7))/2)`

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