September 2018 1 26 Report
Sprawdź, czy podane równości są tożsamościami trygonometrycznymi wiedząc, że α ∈ (0°,90°)

a) sin α × ctg α / cos α = 1

b) cos α × tg α / sin α = 1

c) sin α + sin α ×tg² α = tg α / cos α

d) cos α + cos α ×ctg² α = ctg α / sin α
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