Find theta if theta is between 0 degrees and 90 degrees and tan theta = 7/8, find cos theta

Tan θ = 7/8
θ = tan^-1 (7/8) = 41.2 degrees

cos θ = 0.7526

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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.