Question: Express cos ( + /2) and sin ( + /2) in terms of cos and sin . Find the relation between the coordinates (a,

Express cos (θ + π/2) and sin (θ + π/2) in terms of cos θ and sin θ. Find the relation between the coordinates (a, b) and (c, d) in Figure 24.

(c,d) y (a, b) 1 x

(c,d) y (a, b) 1 x

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