December 2018 1 6 Report
Czy poniższa zależność jest tożsamością trygonometryczną ?
a)  \frac{sin2 \alpha}{ 1+cos2 \alpha } =tg \alpha
b) tg \alpha + ctg \alpha = \frac{2}{sin2 \alpha }
c) ( sin \alpha + cos \alpha )^{2} = sin2 \alpha
d)  cos^{4} \alpha - sin^{4} \alpha = cos2 \alpha
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