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The value of lim(xrarr0)(e^(x)-cos2x-x)/...

The value of `lim_(xrarr0)(e^(x)-cos2x-x)/(x^2)` , is

A

2

B

`(1)/(2)`

C

`(3)/(2)`

D

`(5)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
D

`lim_(xto0)(e^(x)-cos2x-x)/(x^2)`
`lim_(xto0)((e^(x)-1-x)(1-cos2x-))/(x^2)`
`lim_(xto0) (((x^2)/(2!)+(x^3)/(3!)+....)+2sin^2x)/(x^2)`
` =lim_(xto0) {((1)/(2!)+(x)/(3!)+.....)+2((sinx)/(x))^2}=(1)/(2!)+2xx1^2=(5)/(2)`
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OBJECTIVE RD SHARMA ENGLISH-LIMITS-Section I - Solved Mcqs
  1. If the equation of the normal to the curve y=f(x) at x=0 is 3x-y+3=0 t...

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  2. If lim(xrarr1)((asin(x-1)+bcos(x-1)+4))/(x^2-1)=2, then (a,b) is equal...

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  3. If a gt 0 and lim(xrarr oo) {sqrt(x^2+x+1)-(ax+b)}=0, then (a,b) lies ...

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  4. If alpha,beta are two distinct real roots of the equation a x ^3 + x-...

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  5. Let f(x)=(loge(x^2+e^x))/(loge(x^4+e^2x)). If lim(xrarr oo) f(x)=l and...

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  6. lim(nto oo) ((nsqrt(p)+nsqrt(q))/(2))^n,p,q,gt 0 equals

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  7. The value of lim(xrarr0)(e^(x)-cos2x-x)/(x^2) , is

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  8. lim(xrarr0) (2^(|x|)e^(|x|)-|x|log(2)2-1)/(xtanx) is equal to

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  9. If("lim")(xvecoo)(n .3^n)/(n(x-2)^n+n .3^(n+1)-3^n)=1/3, t h e n t h e...

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  10. The value of lim(x to oo)(2x^(1//2)+3x^(1//3)+4x^(1//4)+…………+nx^(1//n)...

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  11. If A,B,C are positive real numbers such that lim(xrarr oo) (sqrt(Ax^2+...

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  12. Let kgt0 and lambda =lim(xrarr0) (k(1-4sqrt(k^2-x^2)))/(x^2sqrt(k^2-x^...

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  13. If f(x)=0 is a quadratic equation such that f(-pi)=f(pi)=0 and f(pi/2)...

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  14. If lim(x->0)(x^n-sinx^n)/(x-sin^n x) is non-zero finite, then n must b...

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  15. If lim(xrarroo) (8x^3+mx^2)^(1//3)-nx exists and is equal to 1 , then ...

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  16. If P(x) is a polynomial such that P(x)+P(2x)=5x^2-18, then lim(xrarr3)...

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  17. If f(x) = lim(n->oo) sum(r=0)^n (tan(x/2^(r+1)) + tan^3 (x/2^(r+1)))/(...

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  18. Let f(x) is a polynomial function and f(alpha))^(2) + f'(alpha))^(2) =...

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  19. If f:[-1,1]toR and f'(0)=lim(ntooo)nf(1/n) and f(0)=0. Find the value ...

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  20. Let f(x)={((tan^(2){x})/(x^(2)-[x]^(2)),"for"xgt0),(1/(sqrt({x}cot{x})...

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