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If (acostheta1,asintheta1),(acostheta2,a...

If `(acostheta_1,asintheta_1),(acostheta_2,asintheta_2)` and `(acostheta_3,asintheta_3)` represent the vertices of an equilateral triangle inscribed in a circle, then (a) `costheta_1+costheta_2+costheta_3=0` (b) `sintheta_1+sintheta_2+sintheta_3=0` (c) `tantheta_1+tantheta_2+tantheta_3=0` (d) `cottheta_1+cottheta_2+cottheta_3=0`

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