cosa=√1-sin^2
cosa=√1-3/49=2√10/7
tga=sina/cosa
tga=(3/7)/(2√10/7)=3√10/20
ctga=cosa/sina
ctga=(2√10/7)/(3/7)=2√10/3
cosa=√1-sin^2
cosa=√1-3/49=2√10/7
tga=sina/cosa
tga=(3/7)/(2√10/7)=3√10/20
ctga=cosa/sina
ctga=(2√10/7)/(3/7)=2√10/3