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CBSE

Gujarati JEE Mathematics : લક્ષ-સાતત્ય અને વિકલન

Multiple Choice Questions

41.

bold જ ો bold space bold f bold left parenthesis bold x bold right parenthesis bold space bold equals bold space fraction numerator bold 2 to the power of bold x bold minus bold 1 over denominator square root of bold 1 bold plus bold ax end root bold minus bold 1 end fraction bold space bold અન ે bold space bold lim with bold x bold rightwards arrow bold 0 below bold space bold f bold left parenthesis bold x bold right parenthesis bold space bold equals bold space bold log subscript bold e bold space bold 4 bold comma bold space bold ત ો bold space bold a bold space bold equals bold space bold. bold. bold. bold. bold. bold. bold space

1
log_e 2-1
log_e 2 + 1
log_e 2

Tips: -

bold lim with bold x bold rightwards arrow bold 0 below bold f bold left parenthesis bold x bold right parenthesis bold space bold equals bold space bold lim with bold x bold rightwards arrow bold 0 below bold space fraction numerator bold 2 to the power of bold x bold space bold minus bold space bold 1 over denominator square root of bold 1 bold plus bold ax end root begin display style bold space end style begin display style bold minus end style begin display style bold 1 end style end fraction bold space bold equals bold space bold space bold lim with bold x bold rightwards arrow bold 0 below bold space fraction numerator begin display style fraction numerator bold 2 bold x bold minus bold 1 over denominator bold x end fraction end style over denominator begin display style fraction numerator square root of bold 1 bold plus bold ax end root begin display style bold minus end style begin display style bold 1 end style over denominator bold x end fraction end style end fraction bold equals bold space bold lim with bold x bold rightwards arrow bold 0 below bold space fraction numerator bold 2 bold x bold space bold minus bold space bold 1 over denominator bold x end fraction bold space bold cross times bold space bold lim with bold x bold rightwards arrow bold 0 below bold space fraction numerator square root of bold 1 bold plus bold ax end root begin display style bold space end style begin display style bold plus end style begin display style bold space end style begin display style bold 1 end style over denominator begin display style fraction numerator bold 1 bold plus bold ax bold minus bold 1 over denominator bold x end fraction end style end fraction bold equals bold space bold 2 over bold a bold space bold log bold 2 bold space bold equals bold space bold 1 over bold a bold space bold log bold space bold 4 bold comma bold space bold આથ ી bold space bold 1 over bold a bold space bold log subscript bold e bold space bold 4 bold space bold equals bold space bold log subscript bold e bold space bold 4 bold space bold equals bold space bold આથ ી bold space bold a bold space bold equals bold space bold 1

42.

bold lim with bold x bold rightwards arrow bold 0 below bold space open square brackets bold tan bold space open parentheses bold x over bold 4 bold space bold _ bold space bold x bold right parenthesis close parentheses close square brackets to the power of bold 1 over bold x end exponent bold space bold equals bold space bold. bold. bold. bold. bold. bold. bold. bold. bold. bold space

e
e²
e^-2
$bold 1 over bold e$

43.

bold lim with bold x bold rightwards arrow bold 0 below bold space bold x to the power of bold 7 bold space open square brackets bold 1 over bold x to the power of bold 3 close square brackets bold space bold equals bold space bold. bold. bold. bold. bold.

0
1
-1
અસ્તિત્વ નથી.

44.

શૂન્યેત્તર વિધેય f એ f(x-y) = $fraction numerator bold f bold left parenthesis bold x bold right parenthesis over denominator bold f bold left parenthesis bold y bold right parenthesis end fraction$ પ્રકારનું છે. જો f'(0) = 5 અને f'(5) = 5, to f(5) = ......

45. જો $bold f bold left parenthesis bold x bold right parenthesis bold space bold equals bold space open curly brackets table attributes columnalign left end attributes row cell bold vertical line bold x bold vertical line bold comma end cell row cell bold left square bracket bold x bold right square bracket bold comma end cell end table close table row cell bold x bold less-than or slanted equal to bold 2 end cell row cell bold x bold greater than bold 2 end cell end table$ તો ..............