1.

`lim_(x rarr 0) ( 10^(x)-2^(x)-5^(x)+1)/(x tan x)` का मान क्या होगा ?A. `(log2)(log4)`B. `(log5)/(log2)`C. `(log5)(log2)`D. `(log3)/(log4)`

Answer» Correct Answer - C
`underset(xrarr0)lim(10^(x)-2x^(2)-5x^(2)+1)/(xtanx)=underset(xrarr0)lim(5^(x).2^(x)-2^(x)-5^(x)+1)/(xtanx)`
`=underset(xrarr0)lim ((5^(x)-1)(2x^(2)-1))/(xtanx)=underset(xrarr0)lim(5^(x)-1)/(x).(2^(x)-1)/(x).(x)/(tan x)`
`=underset(xrarr0)lim(5^(x)-1)/(x).underset(xrarr0)lim(2^(x)-1)/(x).underset(xrarr0)lim(x)/(tan x)`
`=(log5)(log2)(1)=(log5)(log2)`


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