# How do you express #sin(pi/ 8 ) * cos(( ( 5 pi) / 3 ) # without using products of trigonometric functions?

##### 2 Answers

Dec 9, 2017

The answer is

#### Explanation:

Apply the formula

You can easily prove this formula by using

Here,

Therefore,

Dec 9, 2017

Simply calculate the given terms.

#### Explanation:

You "using products of trig functions" statement is not clear. I took it to mean revising the expression to form a single trigonometric identity.

Thus, to avoid that, I simply evaluated the expression by each term.