September 2018 1 26 Report

Sprawdź następujące tożsamości:

a) 11+ctg x=\frac{sin x+cosx}{sin x}

b) (1+cosx)*(1-cosx)=sin^{2}x
c) cos^{2}x-sin^{2}x=1-2sin^{2}x
d) (tg x+ctgx)^{2}=\frac{1}{sin^{2}x*cos^{2}x}


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