April 2019 0 16 Report
Kąt \alpha jest kątem ostrym i cos\alpha = \frac{2}{3} wtedy
sin^{2} \alpha + tg^{2} \alpha wynosi
A: \frac{55}{2}
B:2\sqrt{5} / 9
C:\frac{25}{9}
D:\frac{5}{9} + \sqrt{5} /2

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