Question

5. If y = 1 and x = then in terms of x, y = (A)+1 (B) (C) (D)

Answer 1

The question states:

Notice that the angle for which its measure is arctan(a/b), is the angle that has "a" as the oposite side, and "b" as the adjacent side , so it is the angle on the bottom right of the triangle.

Then the cosine of that angle, is defined as:

cos(angle) = adjacent/hypotenuse = b / squareroot( a^2+b^2)

`\cos (\theta)=\frac{b}{\sqrt[]{a^2+b^2}}`

which agrees with answer D in the list of possible answers given.