January 2019 1 61 Report
Uzasadnić tożsamości trygonometryczne:
a) sin^{4} a+cos^{4}a = 1- \frac{1}{2}sin^{2} 2a
b) tga+ctga=2/(sin2a)
c) tg(a/2)=(1-cosa)/sina
d) sin^{4} a-cos^{4}a = sin^{2} a-cos^{2}a
e) 1/(cosa)-cosa=sina*tga
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