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If f (x) = tan ^(-1) ((cos x- sinx)/(cos...

If `f (x) = tan ^(-1) ((cos x- sinx)/(cos x+ sin x))` then the value of `(d)/(dx) f(x)` is-

A

`-(1)/(2)`

B

`(1)/(2)`

C

1

D

`-1`

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-MULTIPLE CHOICE QUESTIONS
  1. The number of points on the line x+y=4 which are unit distance apart f...

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  2. The value of sqrt(2+sqrt(2+ sqrt(2….oo))) is

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  3. If f (x) = tan ^(-1) ((cos x- sinx)/(cos x+ sin x)) then the value of ...

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  4. If ab = 2a +3b, a gt0, b gt 0, then the minimum value of ab is-

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  5. If 2cos 3theta=1, then the value of theta is

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  6. For any complex number z, the minimum value of |z|+|z-1| is

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  7. The number of common tangent to two circle x ^(2) +y^(2) =4 and x^(2) ...

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  8. If C is a point on the line segment joining A (-3, 4) and B (2, 1) suc...

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  9. If a, b, c are real, then both the roots of the equation (x -b )(x -c)...

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  10. Find the sum of the following geometric series : 1+(1)/(4)+(1)/(16)+...

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  11. A(-2,7),B(7,15),C(-1,-5)andD(h,k) are the vertices of a parallelogram...

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  12. The domain of definition of the function f(x)=sqrt(1+log(e)(1-x)) is

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  13. The value of ["tan"^(-1)(m)/(n)-tan^(-1)((m-n)/(m+n))] is -

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  14. lim(xto2)(sin(e^(x-2)-1))/(log(x-1))

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  15. Let f(x)=(sqrt(x+3))/(x+1) then the value of Lt(xto-3-0)f(x) is

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  16. f(x)=x+|x| is continuous for

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  17. prove that tan((pi)/(4)+(1)/(2) cos ^(-1)""(a) /(b) )+tan ((pi)/(4) ...

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  18. If i=sqrt-1 and n is a positive integer, then i^(n)+i^(n+1)+i^(n+3 is ...

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  19. int(dx)/(x(x+1)) equals

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  20. If x is a positive real number different from 1 such that log(a)^(x),l...

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