1.

Let a=cos^(-1)cos20, b=cos^(-1)cos30, c=sin^(-1)sin(a+b) then If 5sec^(-1)x+10sin^(-1)y=10(a+b+c) then the value of tan^(-1)x+cos^(-1)(y-1) is

Answer»

`PI/2`
`pi/4`
`pi`
0

Answer :B


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