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Let a=cos^(-1)cos20, b=cos^(-1)cos30, c=...

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

A

`pi/2`

B

`pi/4`

C

`pi`

D

0

Text Solution

Verified by Experts

The correct Answer is:
B
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