How to solve the polynomial:
(x-7)^2

( x - 7 )^2 = x^2 - 2*x*7 + 7^2 = x^2 - 14x + 49 because ( a - b )^2 = a^2 -2ab + b^2 ;

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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.