Question: Find the exact value of the given trigonometric function. Do not use a calculator. cosine left parenthesis negative StartFraction 9 pi Over 4 EndFraction right

Find the exact value of the given trigonometric function. Do not use a calculator. cosine left parenthesis negative StartFraction 9 pi Over 4 EndFraction right parenthesis Question content area bottom Part 1 cosine left parenthesis negative StartFraction 9 pi Over 4 EndFraction right parenthesis equals

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