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If the quadratic equation `a x^2+b x+c=0(a >0)` has `sec^2thetaa n dcos e c^2theta` as its roots, then which of the following must hold good? (a.) `b+c=0` (b.) `b^2-4a cgeq0` (c.) c `ccgeq4a` (d.) `4a+bgeq0`

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