If sin^2theta1+sin^2theta2+sin^2theta3=0...

If `sin^2theta_1+sin^2theta_2+sin^2theta_3=0,` then which of the following is not the possible value of `costheta_1+costheta_2+costheta_3?` (a) `3` (b) `-3` (c) `-1` (d) `-2`

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