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Range of Trigonometric Ratios from 0 to 90 Degrees

If a = 3[arc ...

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If a = 3[arc sin(6/11)] and b = 3[arc cos(4/9)] , where the inverse trigonometric functions take only the principal values, then the correct option(s) is (are) A) cosb > 0 B) sinb < 0 C) cos(a+b) > 0 D) cosa < 0

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If sinA=sinB and cosA=cosB, then

[EAMCET 1994]

α = 3 {sin}^{- 1} (\frac{6}{11})

β = 3 {cos}^{- 1} (\frac{4}{9})

, where the inverse trigonometric functions take only the principal values, then the correct option(s) is/are

α = 3 {sin}^{- 1} \frac{6}{11}

β = 3 {cos}^{- 1} \frac{4}{9}

where the inverse trigonometric functions take only the principal values, then the correct option(s) is(are)

cos (B - C) + cos (C - A) + cos (A - B) = - \frac{3}{2}

cos A + cos B + cos C = 0

sin A + sin B + sin C = 0

α = 3 {sin}^{- 1} (\frac{6}{11})

β = 3 {cos}^{- 1} (\frac{4}{9})

where the inverse trigonometric functions take only the principal values. Then

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