February 2019 0 28 Report
Dla  \alpha = 60° prawdziwa jest równość:

C. cos \alpha + cos(90° –  \alpha ) =  \frac{1}{ \sqrt{3} +1 }

Mógłby ktoś to rozpisać?

sin 60° = 0,8660
cos 60° = 0,5
sin 30° = 0,5
cos 30° = 0,8660
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