zadanie 1
Udowodnij tożsamość trygonometryczną.
a) sinx/1-cosx + 1-cosx/sinx=2/sinx
b) ctgx-tgx/sinx+cosx= 1/sinx-1/cosx
c) tgx-ctgx/tgx+ctgx= tg^2 x-1/tg^2 x+1
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b)
c)