Evaluate the following :

$open square brackets table row straight a straight b end table close square brackets open square brackets table row straight c row straight d end table close square brackets plus open square brackets table row straight a straight b straight c straight d end table close square brackets open square brackets table row straight a row straight b row straight c row straight d end table close square brackets$

Solution

open square brackets table row straight a straight b end table close square brackets open square brackets table row straight c row straight d end table close square brackets plus open square brackets table row straight a straight b straight c straight d end table close square brackets open square brackets table row straight a row straight b row straight c row straight d end table close square brackets equals left square bracket space straight a space straight c space plus space straight b space straight d space right square bracket plus space left square bracket space straight a squared plus straight b squared plus straight c squared plus straight d squared space right square bracket space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals left square bracket space ac space plus space bd space plus straight a squared plus straight b squared plus straight c squared plus straight d squared space right square bracket

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