Use the Product-To-Sum Formulas to Rewrite the Product as a Sum

question 2

Short Answer

Use the product-to-sum formulas to rewrite the product as a sum or difference.
​ $\sin \left( \frac { \pi } { 5 } \right) \cos \left( \frac { \pi } { 10 } \right)$ ​

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Definitions:

Median

The central number in a series that divides the upper half from the bottom half.

StdDev

A rephrased term for standard deviation, indicating the degree to which individual data points in a set diverge from the mean value.

Mean

A mathematical average of a set of numbers, calculated by adding them all together and dividing by the number of numbers.

Median

In an arranged sequence of values, the median is the number situated in the middle, thus separating the collection of numbers into two segments.