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tan(1/2Cos^(-1)0)=...

`tan(1/2Cos^(-1)0)=`

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What is the value of tan[(1)/(2)cos^(-1)((3)/(5))]+tan[(1)/(2)cos^(-1)((4)/(5))]? (a) (5)/(6) (b) (-5)/(6) (c) (1)/(2) (d) 0

tan ((1)/(2) cos ^(-1) 0)=

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Prove that tan(pi/4+1/2cos^(-1)(a/b))+tan(pi/4-1/2cos^(-1)(a/b))=(2b)/a .

Prove that tan (pi/4+1/2cos^(-1)""a/b)+tan(pi/4-1/2cos^(-1)""a /b)=(2b)/a