Abcd is a quadrilaterals whose diagonals ac, bd intersect at o. prove that ab+bd+cd+da<2(ac+bd)
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taking LHS
ab+bd+cd+da
commens
ad(b+c)
ab+ac+db+dc
add 2(ac+bd)
ab+bd+cd+da
commens
ad(b+c)
ab+ac+db+dc
add 2(ac+bd)
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