[" 13.If the roots of "ax^(2)+bx+c=0" ar...

[" 13.If the roots of "ax^(2)+bx+c=0" are "sin alpha" and "cos alpha" for some "alpha" ,"],[" then which one of the following is correct? "],[[" (a) "a^(2)+b^(2)=2ac," (b) "b^(2)-c^(2)=2ab],[" (c) "b^(2)-a^(2)=2ac," (d) "b^(2)+c^(2)=2ab]]

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