Cos 47П/6 = cos 11П.6 = 1/2*<span>√3
ctg 25П.4 =ctg П/4 =1
sin 23П/4 =sin 7П/4=-1/2*</span><span>√2
sin 23П/4+ cos 15П/4= sin 7П/4+cos 7П/4=-1/2*</span>√2+1/2*<span>√2=0</span><span>
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Ответ:
30: 1×30, 2×15, 3×10, 5×6.
33: 1×33, 3×11.
42: 1×42, 2×21, 3×14, 6×7.
99: 1×99, 3×33, 9×11.
Вроде бы всё.