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If sinalpha and cosalpha are the roots...

If `sinalpha` and `cosalpha` are the roots of the equation `a x^2+b x+c=0` , then `b^2=`
(a)`a^2-2a c` (b) `a^2+2a c` (c) `a^2-a c` (d) `a^2+a c`

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