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If sinthetaa n d-costheta are the roots ...

If `sinthetaa n d-costheta` are the roots of the equation `a x^2-b x-c=0` , where `a , ba n dc` are the sides of a triangle ABC, then `cosB` is equal to `1-c/(2a)` (b) `1-c/a` `1+c/(c a)` (d) `1+c/(3a)`

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