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18 January, 12:17

Find the 55th derivative of y = cos (3x).

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  1. 18 January, 13:11
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    since the derivative of cos (ax) is - a sin (x) and the derivative of sin (ax) is a cos (ax), then the 55th derivative will be 3^ (55) (-1) ^ (54/2)) (-1) sin (3x) or: 3^ (55) * sin (3x)
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