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[tex] \sqrt{18} (2cos ^{2} \frac{5 \pi }{8} -1)[/tex]
[tex] \sqrt{18} (2cos ^{2} \frac{5 \pi }{8} -1)[/tex]
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√18*(2cos² 5π/8-1)=√18*cos2*(5π/8)=√18*cos5π/4=√*cos(π+π/4)=√18*(-cosπ/4)=-√18*√2/2=-√36/2=-6/2=-3