The formula is 4 cos^3(x)-3 cos(x)
Answer:

Step-by-step explanation:




The answer is
$2,939 (see attachment for formula)
The measure of AN form the given figure is 2. 5cm. Option D
<h3>How to determine the length</h3>
It is important to note that if from one external point, two tangents are drawn to a circle then they have equal tangent segments.
We have that,
AM ≅ AN
so, if AM measures 2. 5cm
AN measures 2. 5cm
Thus, the measure of AN form the given figure is 2. 5cm. Option D
Learn more about tangent lines here:
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Vertical angles are always congruent, which means that they are equal. Adjacent angles are angles that come out of the same vertex. Adjacent angles share a common ray and do not overlap. The size of the angle xzy in the picture above is the sum of the angles A and B.