Sin^2x-3cosx=-0.5 solve the equation graphically it should be in between 0 and 2pi if not solved in radians than in degrees between 0 and 360

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.