evalute using suiatble identites [2a+7][2a-7]
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(2/a+5/b)(2a+5/b)
= (2/a+5/13)2
= (2/a)2+2(2/a)(5/b)+(5/b)2 [Using, (a+b)2=a2+2ab+b2]
= 4/a2+20a/b+25/b2
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