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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?` 3 (b) `-3` (c) `-1` (d) `-2`

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If sin^(2)theta_(1)+sin^(2)theta_(2)+sin^(2)theta_(3)=0, then which of the following is not the possible value of cos theta_(1)+cos theta_(2)+cos theta_(3)?3(b)-3(c)-1(d)-2

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