December 2018 2 9 Report
Wykaż, że jeśli x ∈ R, to:
a) sin ( \frac{ \pi }{3} + x) - sin ( \frac{ \pi }{3} - x) = sin x \\ b) cos( \frac{ \pi }{3} - x) + cos ( \frac{ \pi }{3} + x) = cos x
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