February 2019 0 7 Report
Oblicz wartości wyrażeń:

a)  \frac{5sin \alpha -6cos \alpha }{7cos \alpha +2sin \alpha } tg \alpha =5


b) sin² 21° + cos² 21°

Oblicz:
a) (cos45+cos30) (cos45+cos30)
b) (sin60+cos30) (tg45+ctg60)
c) (tg60+ctg30) - (sin²20+cos²22)

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