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e corect ca tg x * ctg x = 1?

Răspuns :

ctg x = 1/tg x
deci tg x *ctg x = tg x * 1/tgx = 1
[tex]tgx= \frac{sinx}{cosx};ctgx= \frac{cosx}{sinx } \\ tgx*ctgx= \frac{sinx}{cosx} * \frac{cosx}{sinx}=1 [/tex]