# How do you express #cos(pi/ 3 ) * cos (( pi) / 6 ) # without using products of trigonometric functions?

##### 1 Answer

The final answer is

#### Explanation:

For Trig functions, here is your best friend, the trig circle.

What you see here is for every section of the circle you have, there is a value for the cosine and sine for that value.

Therefore if you look at the line of

When you look at the line

Then the multiplication of

#1/2*sqrt3/2=sqrt3/4#