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If Tan^(-1)(1//7)=alpha,Tan^(-1)(1//3)=b...

If `Tan^(-1)(1//7)=alpha,Tan^(-1)(1//3)=beta" then "cos2alpha=`

A

`sin2beta`

B

`sin4beta`

C

`sin3beta`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-INVERSE TRIGONOMETRIC FUNCTIONS-EXERCISE 1
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  5. If Tan^(-1)2x+Tan^(-1)3x=pi//4, then x =

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  7. If "Tan"^(-1)a/x+"Tan"^(-1)b/x=pi/2 then x =

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  8. If Tan^(-1)(1//(a-1))=Tan^(-1)(1//x)+Tan^(-1)[1//(a^(2)-x+1)], then x ...

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  11. If Sin^(-1)x-Cos^(-1)x = (pi)/6 then find x.

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  15. A solution of the equation Tan^(-1)(1+x)+Tan^(-1)(1-x)=pi//2 is

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  19. The value of x where xgt0andtan(Sec^(-1)(1/x))=sin(Tan^(-1)2) is

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