Помогите решить, пожалуйста!!!!!!!!!!!!!!!!!!!!!!!!!!
1) sina=√2/3
cosa=√(1-(√2/3)²)=√(7)/3
tga=sina/cosa=√2/3×3/√7=√(14)/7
ctga=cosa/sina=√(7)/3×3/√2=√(14)/2
2) cosa=15/17
sina=√(1-(15/17)²)=-8/17
tga=sina/cosa=-8/17×17/15=8/15
ctga=cosa/sina=15/17×(-17/8)=15/8