Question: 12 [11 points] Let & be an angle in the plane such that cosd = -= and tand (d) (f) [I I points] Let angle

(d) (f) [I I points] Let angle t he plane that cos

12 [11 points] Let & be an angle in the plane such that cosd = -= and tand

(d) (f) [I I points] Let angle t he plane that cos = And C O. the Angle in the correct With proper labeling. find cos(20) If a known trigonometric identity is Clearly Show it in your work.

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