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23 May, 00:13

Express the trigonometric function in terms of its positive acute reference angle. cos298° = cos

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  1. 23 May, 00:37
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    298 * falls in quadrant 4 is 0 * is the positive x-axis. In quadrant 4, cos is positive. Therefore, we simply need to calculate the acute angle, x, that correlates to 298*.

    360 = 298 + x

    62 = x

    Therefore, we have:

    cos (298*) = cos (62)

    In case you need to know:

    sin (298*) = - sin (62)

    tan (298*) = - tan (62)

    Since both sin and tan are negative in the fourth quadrant.
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