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Show that cos^(-1) ((cosx+cos y)/(1+cos ...

Show that `cos^(-1) ((cosx+cos y)/(1+cos x.cosy))= 2tan^(-1)(tan(x/2).tan(y/2))`.

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Prove that ""(1)/(2)cos^(-1)""((5cos x+3)/(5+3 cos x))= tan^(-1)""((1)/(2)tan""(x)/(2))

(1)/(2)cos ^(-1)""((5 cos x +3)/(5+3 cos x))= tan^(-1)""((1)/(2)tan ""(x)/(2))

(sin x - sin y)/( cos x + cos y) = tan ""(x-y)/(2)

Show that sin (cot^(-1) (tan cos^(-1)x)) =x

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show that 2 tan ^(-1) ((1+x)/(1-x)) - cos ^(-1)( (1-x^(2))/(1+x^(2)))=(pi)/(2)

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UNITED BOOK HOUSE-SET 3-EXERCISE
  1. Events A and B are such that P(A) =(1)/(2), P(B) =(7)/(12) and "P(not ...

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  2. A binomial distribution B(n,p) has the mean 8 and variance 8/3. Find ...

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  3. Show that cos^(-1) ((cosx+cos y)/(1+cos x.cosy))= 2tan^(-1)(tan(x/2).t...

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  4. By row transformation find inverse of the matrix A= [[1,3,2],[-3,-3,-1...

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  5. Show that, A = 1/3[[1,2,2],[2,1,-2],[-2,2,-1]] are orthogonal matrix a...

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  6. Prove that, |[(a+1)(a+2),a+2,1],[(a+2)(a+3),a+3,1],[(a+3)(a+4),a+4,1]|...

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  7. If y = 3e^(2x)+2e^(3x) then show that y2-5y1 +6y=0

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  8. If x = sqrt(a^(sin^(-1)t)) and y= sqrt(a^(cos^(-1)t) show that (dy)/(...

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  9. Evaluate: int(sin^(-1)x)/(x^2 dx

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  10. Evaluate: int (dx)/(x(x^n+1))

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  11. Solve: (dy)/(dx)+y/x = e^x

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  12. Solve: (dy)/(dx) = (2x+3y)/(3x+2y)

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  13. If veca = hati+hatj + hat k, vecb=hati+hatj,vec c= hati and (vec axxve...

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  14. If vec a= hat i+hat j- hat k, vec b= -hat i+2 hat j+ hat k and vec c =...

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  15. Prove that overset(2)underset(-2)int |1-x^2|dx=4

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  16. Evaluate (with the help of definite integral) underset(n rarr infty)...

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  17. If two dice are rolled 12 times, obtain the mean and varianve of the d...

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  18. Find the equation to the curve passing through (2,2) and having its ...

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  19. Find the area of the parallelogram whose two adjacent sides are 3i+4j ...

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  20. The foot of the perpendicular drawn from the origin 0 to a plane is N(...

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