Aright triangle in which one acute angle is a reference angle for a 115 degree angle in standard position intersects the unit circle at (-0.423, 0.906). what is the approximate value of cos 115 degree?

Step-by-step explanation:

The parametric equations of a circle is

and

The radius of the unit circle is 1 unit.

This implies that any point on the unit circle is represented by:

and

where is the angle in standard position,

From the question, the given angle in standard position is .

This angle intersects the unit circle at

But

We substitute and

This implies that:

the answer is "add 2y and y"

step-by-step explanation:

you need to collect the like terms first.

question

given the diagram below, what is md?

the sum of the interior angles is 360°

take away from 360 the sum of the knows angles and you will have the angle d.

360 - 108 - 108 - 72 = 72°