December 2018 1 55 Report
Wiedząc, że α jest kątem ostrym, oblicz wartość wyrażenia

a)  \frac{ctg \alpha -cos \alpha }{ctg \alpha } gdy  sin \alpha = \frac{1}{5}

b)  \frac{1}{cos \alpha } -cos \alpha gdy  tg \alpha = \sqrt{2}

c)  \frac{cos ^{4} \alpha }{sin ^{2} \alpha } gdy  ctg^{2} \alpha =5

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