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Step-by-step explanation:

If the angles of one triangle are equal to the angles of another triangle, then the triangles are said to be equiangular.

Equiangular triangles have the same shape but may have different sizes.  So, equiangular triangles are also called similar triangles.

For example, triangle DEF is similar to triangle ABC as their three angles are equal.

The length of each side in triangle DEF is multiplied by the same number, 3, to give the sides of triangle ABC.

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b