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Expand the identity:(?a+?b)(?c+?d)

D e a r S t u d e n t, i f y o u r q u e s t i o n i s : e x p a n d (\sqrt{a} + \sqrt{b}) (\sqrt{c} + \sqrt{d}), t h e n t h e s o l u t i o n i s a s f o l l o w s : (\sqrt{a} + \sqrt{b}) (\sqrt{c} + \sqrt{d}) = \sqrt{a} (\sqrt{c} + \sqrt{d}) + \sqrt{b} (\sqrt{c} + \sqrt{d}) = \sqrt{a} . \sqrt{c} + \sqrt{a} . \sqrt{d} + \sqrt{b} . \sqrt{c} + \sqrt{b} . \sqrt{d} = \sqrt{a c} + \sqrt{a d} + \sqrt{b c} + \sqrt{b d} R e g a r d s!

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