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Sir plz anyone cn solve this.. I m dancing prblm to solve it..plz answer in details

Sir plz anyone cn solve this.. I m dancing prblm to solve it..plz answer in details

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Grade:12th pass

1 Answers

Ram Kushwah
110 Points
3 years ago
We know that
(ex+e-x )/2 = 1+ x^2/2! + x^4/4! +  x^6/6! +...................................∞
Putting=1/2 we get
( √e +1/√e )/2  =1+1/4.2!+1/16.4!+1/64.6+...................................∞
Thus
1+1/4.2!+1/16.4!+1/64.6+...................................∞
=( √e +1 /√e) /2  
= (e +1 )/2√e
Thus option (A) is correct

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