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If y =a cos 2x +b sin 2x then y (2) + 4y...

If `y =a cos 2x +b sin 2x` then `y _(2) + 4y =`

A

2

B

1

C

0

D

none

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C
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DIPTI PUBLICATION ( AP EAMET)-DIFFERENTIATION -EXERCISE 1D
  1. If f (x) = (x ^(2))/(a +x) then f ''(a) =

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  2. If y = sqrt(ax) + (a ^(2))/(sqrt(ax))then y (1) , y (2) at x =a are

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  3. If y =a cos 2x +b sin 2x then y (2) + 4y =

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  4. If y = 3 ^(x), then (d ^(2) y)/(dx ^(2)) =

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  5. If y = xe^(-x) then y (2) + 2y (1) + y =

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  6. If y = x ^(2)cos 3x then y (2) at x=0 is

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  7. If x = e ^(2t ) cos, 3t, then (d ^(2) x)/(dt ^(2))at t = pi //2 is

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  8. Show that y=x+tanx satisfies the equation cos^(2)x(dy^(2))/(dx^(2))+2x...

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  9. If y= sin (sin x) then y (2) + (tan x) y (1) + y (cos ^(2) x)=

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  10. If y (k) is the kth derivative of y with respect to x,y= cos (sin x) ...

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  11. If y = ax ^(2) + b// x then x ^(2) y (2) =

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  12. If y = ax ^(4) + (b)/(x ^(3)), then (d ^(2) y)/( dx ^(2)) =

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  13. If y = a cos x + (b + 2x ) sin x then y (2) + y =

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  14. If y =a + be ^(-4x) then y (2) + 4y (1) =

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  15. If y = ax + b//x then x ^(2) y(2) + xy (1) -y=

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  16. If xy = ae ^(x) + be^(-x) then xy (2) + 2y (1) - xy =

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  17. If y = (x+ sqrt(x ^(2) -1))^(m) then (x ^(2) -1) y(2) + xy (1)=

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  18. If y = xe ^(- 1//x) then x ^(3) y (2) - xy (1) +y=

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  19. If y = e ^(Sin^(-1)x ) then (1 - x ^(2)) y (2) - xy(1) -y=

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  20. If y = sin (log (e) x) then (x ^(2) (d ^(2) y)/(dx ^(2)) +x (dy )/(dx)...

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