24.
tan^2(x)=sin^2(x)/cos^2(x)
1=cos^2(x)/cos^2(x)
1+ tan^2(x)=(cos^2(x)/cos^2(x))+(sin^2(x)/cos^2(x))=(cos^2(x)+sin^2(x))/cos^2(x) => RELATIA I
1=sin^2(x)+cos^2(x) (FORMULA MATEMATICA!!!)
1/(cos^2(x))=(sin^2(x)+cos^2(x))/cos^2(x) => RELATIA II
RELATIA I = RELATIA II => cele doua relatii de la exercitiul 24 sunt adevarate
25
NU AI ATASAT NICI O RELATIE LA 25!!!
