December 2018 0 311 Report

1)Sa se arate ca sin^2 \ 1^0+sin^2 \ 2^0+...+sin^2 \ 90^0= \frac{91}{2}


2)Fie hexagonul regulat ABCDEF de latura 4. Sa se calculeze modulul vectorului \overrightarrow{AC}+\overrightarrow{BD}

Rog enuntarea formulelor folosite.

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