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sin^(-1)(4/5)+cos^(-1). 5/13 +sec^(-1)(5...

`sin^(-1)(4/5)+cos^(-1). 5/13 +sec^(-1)(5/4)+"cosec"^(-1)(13/5)` is :

A

pi

B

0

C

`pi/2`

D

`-pi`

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