Упросить выражение:
2) 1-sin²α (1+ctg²α)
4) [tex] \frac{1+tg^{2} a }{1+ctg ^{2} a} [/tex]
2) 1-sin²α (1+ctg²α)
4) [tex] \frac{1+tg^{2} a }{1+ctg ^{2} a} [/tex]
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