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If alpha=3sin^-1(6/(11)) and beta=3cos^-...

If `alpha=3sin^-1(6/(11))` and `beta=3cos^-1(4/9)`, where the inverse trigonometric functions take only the principal values, then the correct option(s) is(are)

A

`cosbeta gt 0`

B

`sinbeta lt 0`

C

`cos(alpha +beta) gt 0`

D

`cosalpha lt 0`

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The correct Answer is:
B, C, D
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