ctg(pi +a) = ctg a
tg (3pi/2 - a) = ctg a
1+ ctg(p+a) tg (3p/2 - a) = 1+ ctga*ctga = 1/ (sin^2(x))
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ctg(pi +a) = ctg a
tg (3pi/2 - a) = ctg a
1+ ctg(p+a) tg (3p/2 - a) = 1+ ctga*ctga = 1/ (sin^2(x))