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

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

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`\sin ^{-1} \{x}+\sin ^{-1}(1-\x)=\cos ^{-1} x `
`\Rightarrow \sin ^{-1}(1-x)=\frac{\pi}{2}-2 \sin ^{-1} x `
`\Rightarrow \quad(1-x)=\sin (\frac{\pi}{2}-2 \sin ^{-1} x)`
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  15. Prove the following: tan^(-1)(1/7)+2\ tan^(-1)(1/3)=pi/4

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  16. Prove the following : sin^(-1)(4/5)+2\ tan^(-1)(1/3)=pi/2

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  17. Prove that 2sin^-1[3/5]-tan^-1[17/31]=pi/4

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  18. Prove the following: 2\ tan^(-1)(3/4)-tan^(-1)((17)/(31))=tan^(-1)(pi/...

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  19. Prove that: 2tan^(-1)(1/2)+tan^(-1)(1/7)=tan^(-1)((31)/(17))

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  20. Prove that: tan^(-1)((1-x^2)/(2x))+cot^(-1)((1-x^2)/(2x))pi/2

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