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First, find the positive co-terminal angle of 30.

Add 360 to 30 that is, 30 + 360 = 390.

Add 720 to 30 that is 30 + 720 = 750.

The multiples of 360 are subtracted from 30 to find the negative co-terminal angles.

Subtract 360 from 30 that is, 30 - 360= -330.

Subtract 720 from 30 that is 30 - 720 = -690.

First, find the positive co-terminal angle of 45.

Add 360 to 45 that is, 45 + 360 = 405.

Add 720 to 45 that is 45 + 720 = 765.

The multiples of 360 are subtracted from 30 to find the negative co-terminal angles.

Subtract 360 from 45 that is, 45 - 360= -315.

Subtract 720 from 45 that is 45 - 720 = -675.