PLEASE SOLVE IT ..................
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Step-by-step explanation:
AD² = AC² - DC² = AB² - BD²
AC² - DC² = AB² - BD²
AC² = AB² + DC² - BD²
AC² = AB² + (DC - BD)( DC+BD)
AC² = AB² + BC (DC - BD)
AC² = AB² + BC (BC - BD - BD) = AB² + BC (BC - 2BD )
AC² = AB² + BC² - 2BCBD
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