Question

Rezolvati ctg5x = tgx

Answer 1

ctg5x=tgx, dar tgx=ctg($(\frac{ \pi }{2}-x)$, deci 5x=$\frac{ \pi }{2}-x+k \pi$, deci 6x=$\frac{ \pi }{2}+k \pi$, sau  $x= \frac{ \pi }{12}+k \frac{ \pi }{6}$unde,k ∈Z.