December 2018 1 12 Report
Uzasadnij tożsamość:
a)  \frac{cos a}{sin a-1} +tg a=- \frac{1}{cos a}
b)   \frac{1}{1+ tg^{2} \alpha } =(1-sin \alpha )(1+sin \alpha )
c) \frac{2}{ cos^{2} \alpha } - (tg \alpha + \frac{1}{tg \alpha } )^2= tg^{2} \alpha - \frac{1}{ tg^{2} \alpha }
d) 1-2 sin^{2} \alpha * cos^{2} \alpha =sin^4 \alpha +cos^4 \alpha
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