Question 1112841
Use a calculator.
==========
I don't see where I was being funny, or trying to be funny.
If you specify w/o using a calculator, then all the work is necessary.
If not, adding the 2 sines, then raising it to the 6th power gives 3.375, the same answer.
====================
Or,
{{{sin(15) = (sqrt(6) - sqrt(2))/4}}}
{{{sin(75) = (sqrt(6) + sqrt(2))/4}}}
{{{sin(15) + sin(75) = sqrt(6)/2}}}
6th power --> 216/64 = 3.375
=============
Most people don't know the sine of 15 or 75 degs, tho.
Do you find that humorous?
PS  The "funny bone" is at the end of the humerus.