X2 -9x – 10 = 0
( x + ) ( x + )

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)

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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.