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sin²α + cos²α = 1
cos²α = 1 - 4/25
cos²α = 21/25
cosα = √21/5
tgα = 2/5 / √21/5 = 2/5 * 5/√21 = 2√21/21
W = 2/5 * 21/2√21 = 21/5√21 = 21√21/105 = √21/5
pzdr ;)
w odp powinno byc sin/ tg
pzdr.