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Determine one positive and negative coterminal angle for 300 -420 -9pi/4 and 8pi/9?

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  1. 300 deg has coterminal angles:

    300 + 360 = 660 deg,

    300 - 360 = - 60 deg.

    - 420 deg has:

    720 - 420 = 300 deg

    360 - 420 = - 60 deg.

    - 9pi / 4 has:

    2pi - (9pi / 4) = - pi / 4,

    4pi - (9pi / 4) = 7pi / 4.

    8pi / 9 has:

    2pi + (8pi / 9) = 26pi / 9,

    - 2pi + (8pi / 9) = - 10pi / 9.

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