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If cos alpha and cos beta(0 < alpha &...

If `cos alpha and cos beta(0 < alpha < beta < pi)` are the rootsof the quadratic equation `4x^2 - 3 = 0,` the what is the value of `sec alpha xx sec beta?` (i) `-4/3` (ii)`4/3` (iii)`3/4` (iv)`-3/4`

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