August 2018 1 71 Report
Uzasadnij tożsamości:
a) sin( 180- alfa)/sin(90+alfa)*tg (270-alfa=1
b) cos(90- alfa)*ctg(360- alfa)/sin(270+alfa)=1
c)cos2alfa= ctg alfa/tg alfa +ctg alfa
d)tg alfa* ctg alfa/ 1- sin2 alfa=tg2 alfa+1
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