4. (a) Let 0 be an acute angle in a right triangle. Identify the opposite side, the adjacent side, and the hypotenuse in the figure. (b) Define the six trigonometric ratios in terms of the adjacent and opposite sides and the hypotenuse. (c) Find the six trigonometric ratios for the angle 0 shown in the figure. (d) List the special values of sine, cosine, and tangent.

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