Упростите выражение: Sin^2 alpha + cos^2 alpha + ctg^2 alpha
Sin^2 alpha + cos^2 alpha + ctg^2 alpha=1+ctg^2 alpha=1/(Sin^2 alpha)
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Sin^2 alpha + cos^2 alpha + ctg^2 alpha=1+ctg^2 alpha=1/(Sin^2 alpha)