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5 February, 00:24

Solve for x. cos (6x) = sin (3x - 9) A. x = 10 B. x = 11 C. x = - 10 D. x = 12

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  1. 5 February, 02:12
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    For complementary angles, (angles that add up to 180),

    sin x = cos (90-x)

    where x is an acute angle.

    Therefore, in this case cos (6x) = sin (3x-9)

    Then; 6x + 3x - 9 = 90

    9x = 99

    x = 11

    The correct answer is therefore B. x = 11
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Home » Mathematics » Solve for x. cos (6x) = sin (3x - 9) A. x = 10 B. x = 11 C. x = - 10 D. x = 12
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