Question 436091
Find the exact value of sin(7pi/12) by using a sum or difference formula.

<pre>
{{{sin(7pi/12) = sin(4pi/12+3pi/12) = sin(pi/3+pi/4) = sin(pi/3)cos(pi/4) + cos(pi/3)sin(pi/4) = (sqrt(3)/2)(sqrt(2)/2)+(1/2)(sqrt(2)/2)=sqrt(6)/4+sqrt(2)/4 = (sqrt(6)+sqrt(2))/4}}}

Edwin</pre>