4. Identify the vertex, focus, and directrix. y=1/12x^2

O vertex (0, 0); focus (3, 0); directrix at y = 3
O vertex (0, 0); focus (3, 0); directrix åt y = -3
O vertex (0, 0); focus (0, 3); directrix at y = 3
O vertex (0, 0); focus (0, 3); directrix at y = -3

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

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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.