Question

номер 862  решите плизз)))))

Answer 1

2sin15cos15=sin30=$frac{1}{2}$

$8sinfrac{pi}{8}cosfrac{pi}{8}=4sinfrac{pi}{4}=4*frac{sqrt{2}}{2}=2sqrt{2}$

$cos^{2}15-sin^{2}15=cos30=frac{sqrt{3}}{2}$

$4cos^{2}frac{pi}{8}-4sin^{2}frac{pi}{8}=4cosfrac{pi}{4}=2sqrt{2}$