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

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

`cos beta gt 0`

B

`sin beta lt 0`

C

`cos ( alpha + beta) gt0`

D

`cos alpha lt 0`

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
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