Question: Suppose sin (a) = 9 and the trigonometric point P(a) is in the third quadrant. Use a trigonometric identity to find cos (-a). 10

Suppose sin (a) = 9 and the trigonometric point P(a) is in the third quadrant. Use a trigonometric identity to find cos (-a). 10 (Express numbers in exact form. Use symbolic notation and fractions where needed.) cos (-a) =

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