Tga/2+tga+2tg2a+4tg4a+8ctg8a=
( по формуле ctg2a=(ctga-tga)/2)
1)4tg4a+4ctg4a-4tg4a=4ctg4a
2)tga/2+tga+2tg2a+2(ctg2a-tg2a)=
tga/2+tga+2ctg2a=tga/2+tga+ctga-tga=
tga/2+ctga=tga/2+(ctga/2-tga/2)*1/2=
(tga/2+ctga/2)/2
1265=5*11*23, 539=7*7*11, 4092=2*2*3*11*31, 375=5*5*5*3,
189=3*3*3*7, 210=2*3*5*7, 198=2*3*3*11, 30030=2*5*3*7*11*13