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30. Let 0 be an angle in the first quadrant with cos 0 = a. (See Figure 7.24.) Evaluate the following in terms of a.

30. Let 0 be an angle in the first quadrant with cos 0 = a. (See Figure 7.24.) Evaluate the following in terms of a. (a) cos(0 + 360) (b) cos(0 + 180 ) (c) sin(90 - 0) (d) cos(180 - 0) (e) cos(360 - 0) (f) sin(270 - 0) a = cos 0 Figure 7.24

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