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The value of cos (2Cos^-1 0.8) is...

The value of `cos (2Cos^-1 0.8)` is

A

0.48

B

0.96

C

0.6

D

none of these

Text Solution

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The correct Answer is:
D
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OBJECTIVE RD SHARMA-INVERSE TRIGONOMETRIC FUNCTIONS -Exercise
  1. If xy +yz+zx=1 then tan^(-1)x+tan^(-1)y+tan^(-1)z=

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  2. If x1,x2, x3, x4 are the roots of the equation x^4-x^3 sin2 beta+ x^2....

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  3. The value of cos (2Cos^-1 0.8) is

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  4. If 0 le x le 1 then cos^(-1)(2x^(2)-1) equals

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  5. The value of tan[cos^(-1)(4/5)+tan^(-1)(2/3)] is 6/(17) (b) 7/(16) (...

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  6. The value of tan[1/2cos^(-1).sqrt5/3] is

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  7. If sin^(-1) ((2a)/(1+a^2))+ sin^(-1) ((2b)/(1+b^2)) = 2 tan^(-1)x then...

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  8. The value of cot^(-1){(sqrt(1-sinx)+sqrt(1+sinx))/(sqrt(1-sinx) -sqr...

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  9. The value of sin[cot^(-1){cos(tan^(-1) x)}] is

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  10. If x >1 , then 2\ tan^(-1)x+sin^(-1)((2x)/(1+x^2)) is equal to 4tan^(-...

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  11. If A=tan^-1((xsqrt3)/(2k-x)) and B=tan^-1((2x-k)/(ksqrt3)) then find t...

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  12. If sin^(-1)x+sin^(-1)(1-x)=cos^(-1)x then x equals

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  13. If -1 le x le 0 then cos^(-1)(2x^(2)-1) equals

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  14. If -1/2 le x le 1/2 hence sin^(-1)(3x-4x^(3)) equals

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  15. The value of sin^(-1)(sin 10) is

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  16. The value of tan^(-1)1+tan^(-1)2+tan^(-1)3 is

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  17. The value of sin^(-1)[cos((33pi)/5)] is

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  18. Find the smallest and the largest values of tan^(-1) ((1 - x)/(1 + x))...

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  19. The least and the greatest values of (sin^(-1)x)^3+(cos^(-1)x)^3 are (...

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  20. If a le 1/32 then the number of solution of (sin^(-1) x)^(3) +(cos^(...

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