(tg+ctg)^2 * (sin^4 + cos^2) = tg
tg^+2tg*ctg+ctg^2 * sin^4/cos + cos^2/sin=tg
1+2tg*ctg*tg+ctg
1+2tg*ctg
1*2tg*1/tg
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(tg+ctg)^2 * (sin^4 + cos^2) = tg
tg^+2tg*ctg+ctg^2 * sin^4/cos + cos^2/sin=tg
1+2tg*ctg*tg+ctg
1+2tg*ctg
1*2tg*1/tg