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[tex] \sqrt{32} cos^{2} \frac{13 \pi }{8} - \sqrt{32} sin^{2} \frac{13 \pi }{8}[/tex]
[tex] \sqrt{32} cos^{2} \frac{13 \pi }{8} - \sqrt{32} sin^{2} \frac{13 \pi }{8}[/tex]
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=√32·cos13π/4=√32·cos(2π+π+π/4)=
=-√32·cosπ/4=-4√2·√2/2=-4