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If α = 3sin-1(6/11) and β = 3cos-1(4/9), where the inverse trigonometric functions take only the principal values,

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

(A) cos β > 0

(B) sin β < 0

(C) cos (α + β) > 0

(D) cos α < 0

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1 Answer

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Best answer

Correct option (C) cos (α + β) > 0

Explanation:

 

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