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what PDF is this dear plz give that link clearly
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(Ans 5) a^(-1)/(a^(-1)+ b^(-1) ) + a^(-1)/(a^(-1)- b^(-1) ) = (1/a)/(1/a + 1/b) + (1/a)/(1/a - 1/b)
= (1/a)/(b/ab + a/ab) + (1/a)/(b/ab - a/ba)
= ( 1/a x ab/(a+b) ) + ( 1/a x ab/(b-a) )
= ( (b(b-a)+b(a+b))/((a+b)(b-a)) )
= ( (b^2-ab+ab+ b^2)/((a+b)(b-a)) )
= ( (2b^2)/((a+b)(b-a)) )
= ( (2b^2)/((b^2- a^2)) )
(ans8) and (ans 9) will upload soon...
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