tg a=1/ctg a =>ctga=24/10
1+ctga= 1/sin^2 a
1+(24/10)^2=1/sin^2a
1+576/100=1/sin^2a
Sqrt(676/100)= 1/sin^2a
sina = 5/13
sina = -5/13
tg a=1/ctg a =>ctga=24/10
1+ctga= 1/sin^2 a
1+(24/10)^2=1/sin^2a
1+576/100=1/sin^2a
Sqrt(676/100)= 1/sin^2a
sina = 5/13
sina = -5/13