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let a = min (x²+4x+5,x belongs to R ) and b = lim??01-cos 2?÷?²then find the value of a-b÷a+b

kenadi kumar , 10 Years ago
Grade 12
anser 1 Answers
Sunil Raikwar

Last Activity: 10 Years ago

a=(x+2)2+1

so minimum value of a is 1
b=lim(x tend to 0) {1-cos2x/x2}=lim(x tend to 0) {2sin2x/x2}=2lim(x tend to 0){sinx/x}=2
(a-b)/(a+b)=(1-2)/(1+2)=-1/3

Thanks & Regards
Sunil Raikwar
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