September 2018 1 18 Report

Proszę o pomoc.

Sprawdź czy wyrażenie jest tożsamościa:

A. 1-2cos^{2}\alpha=2sin^{2}\alpha-1</p> <p> B. 1+tg^{2}\alpha=\frac{1}{cos^{2}\alpha}</p> <p> C. (tg^{2}\alpha-sin^{2}\alpha)ctg^{2}\alpha=sin^{2}\alpha

D.


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