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30 January, 10:35

If cos A = 12/13, and ∠A is in the fourth quadrant, find the exact value of sin2A.

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  1. 30 January, 13:35
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    Answer: 0.71

    Step-by-step explanation:

    we have that cos (A) = 12/13

    then:

    A = Acos (12/13) = 22.62°

    But A is in the fourth quadrant, so A is actually 22.62° + 180° = 202.62°

    Then Sin (2A) = sin (2*202.62°) = 0.71
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