Question

3sin(2*Пи/4-Пи/4)+2cos(3*Пи/4-Пи)=

Answer 1

3sin(pi/2-pi/4)+2cos(3pi-4pi/4)=3sin(pi/4)+2cos(-pi/4)=3*sqrt2/2+2*sqrt2/2=3sqrt2/2+sqrt2=3sqrt2+2sqrt2/2=5sqrt2/2


sqrt-корень