February 2019 0 12 Report
Wartość wyrażenia cosα + cos(90° - α) dla α=60° jest równa:

A.  \frac{1}{ \sqrt{3}-1}
B.  \frac{ \sqrt{3}+1}{4}
C.  \frac{ \sqrt{3}}{2}
D.  \frac{1}{2}

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