Find the sum then write it's arithmetic, geometric or neither.

Is -1-2-3-4-5-6= - (1+2+3+4+5+6)=-21

It is an arithmetic sum

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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.