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If cos^(-1)x/a+cos^(-1)y/b=alpha, prove ...

If `cos^(-1)x/a+cos^(-1)y/b=alpha,` prove that `(x^2)/(a^2)-2(x y)/(a b)cosalpha+(y^2)/(b^2)=sin^2alpha`

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ALLEN -INVERSE TRIGONOMETRIC FUNCTIONS-All Questions
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  2. If f(x)=cos^(- 1)x+cos^(- 1){x/2+1/2sqrt(3-3x^2)}then

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  3. If cos^(-1)x/a+cos^(-1)y/b=alpha, prove that (x^2)/(a^2)-2(x y)/(a b)c...

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  6. Prove that: tan^(-1) \ 2/3=1/2tan^(-1) \ 12/5

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  7. the value of 3tan^- 1(1/4)+tan^- 1(1/20)+tan^- 1(1/1985)

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  8. If sin^2x + sin^2y < 1 ; x, y in R then prove that sin^-1(tanx . tany...

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  9. Prove that : cot^(-1)((1+ab)/(a-b))+cot^(-1)((1+bc)/(b-c))+cot^(-1)((1...

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  10. Let cos^(-1)(x)+cos^(-1)(2x)+cos^(-1)(3x) = pi If x satisfies the equa...

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  15. Solve sin^(-1)x-cos^(-1)x=sin^(-1)(3x-2)

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  16. Solve the following equation: sin^(-1)x+sin^(-1)(1-x)=cos^(-1)x

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  17. If 1/2tan^(- 1)((2x)/(x^2-1))+cos^(- 1)((x^2-1)/(x^2+1))=(2pi)/3 the...

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  18. Find the sum of the series :(tan^- 1)1/3+(tan^- 1)2/9+....+(tan^- 1)(2...

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  19. Find the sum to n terms cot^(-1)(3)+cot^(-1)(7)+cot^(-1)(13)+ cot^(-1)...

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  20. Find the sum of each of the following series :(i) tan^-1(1/(x^2+x+1))+...

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