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Step-by-step explanation:
L.H.S = AD^2
AD ^2 = BD^2 + AB^2
= BD^2 + BC^2
= (BC + CD)^2 + BC^2
= BC^2 + CD^2 + 2BC×CD + BC^2
= 2BC^2 + 2BC×CD + CD^2
= 2BC(BC+CD) + CD^2
= 2BC×BD + CD^2
= R.H.S
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