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

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