Question 1164669
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{{{cos(pi/4) = sqrt(2)/2}}}<br>
{{{sin(pi/6) = 1/2}}}<br>
{{{(cos(pi/4)+sin(pi/6))^2 = (sqrt(2)/2+1/2)^2}}}<br>
I will assume since you are asking a question about trigonometry that you can do that calculation.<br>