proszę o pomoc i z góry dzięki!!!!!!!!!!!!!!!!!
sprawdż tożsamość bez założeń
(cosx+tgxsinx)ctgx=1/sinx
L = (cosx+sinx/cosx * sinx)* cosx/sinx=
= (cos²x/cosx+sin²x/cosx)* cosx/sinx=
= (cos²x+sin²x)/cosx * cosx/sinx=
= 1/cosx * cosx/sinx= 1/sinx = P
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L = (cosx+sinx/cosx * sinx)* cosx/sinx=
= (cos²x/cosx+sin²x/cosx)* cosx/sinx=
= (cos²x+sin²x)/cosx * cosx/sinx=
= 1/cosx * cosx/sinx= 1/sinx = P