Write each equation in standard form. identify a, b,c.

Write in y=ax²+bx+c form
solve for y

given

solve for y

easy
minus 4 both sides

times -1/2 to both sides



2=10/5


y=ax²+bx+c


a=0
b=
c=

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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.