Sprawdź tożsamość trygonometryczną: a) ( tg [latex] alpha [/latex] + ctg [latex] alpha [/latex] )^2=[latex] frac{1}{sin ^{2} alpha * cos ^{2} alpha }[/latex] b) tg[latex] alpha [/latex] - ctg [latex] alpha [/latex] = ( tg [latex] alpha [/latex] -1) (ctg

Sprawdź tożsamość trygonometryczną: a) ( tg [latex] alpha [/latex] + ctg [latex] alpha [/latex] )^2=[latex] frac{1}{sin ^{2} alpha * cos ^{2} alpha }[/latex] b) tg[latex] alpha [/latex] - ctg [latex] alpha [/latex] = ( tg [latex] alpha [/latex] -1) (ctg[latex] alpha [/latex]+1) c) ctg[latex] alpha [/latex] + [latex] frac{sin alpha }{1+cos alpha } [/latex] = [latex] frac{1}{sin alpha } [/latex]