Question 1028370
<pre>
Use a product-to-sum formula to find the exact value of the expression. Do not use a calculator.

cos 5&#960;/12  sin &#960;/12
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The other person's answer is a bit off, thereby making it INCORRECT!
It should be: 
{{{cos((5pi)/12)*sin(pi/highlight(12)) = (1/2)(sin(pi/2) - sin(pi/3)) = highlight(1 - sqrt(3)/2)}}}, or {{{highlight((2 - sqrt(3))/2)}}},
and <font color = blue><font size = 4><b><u>NOT</font></font></b></u>
{{{cos((5pi)/12)*sin(pi/2) =(1/2)(sin(pi/2) - sin(pi/3)) = (1-sqrt(3)/2)/2 = (2-sqrt(3))/4}}}</pre>