1.

cos^(-1)((3+5cosx)/(5+3cosx)) is equal to

Answer»

`TAN^(-1)(1/2"tan"x/2)`
`2TAN^(-1)(2"tan"x/2)`
`1/2tan^(-1)(2"tan"x/2)`
`2tan^(-1)(1/2"tan"x/2)`

ANSWER :D


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