Resposta :
tga+cotga=2
tga+1/tga=2 chamando tga de x tg=x
x+1/x=2
x²+1=2x
x²-2x+1=0
delt=b²-4.a.c
delt=(-2)²-4.1.1
delt=4-4=0
x=(-b+raizdelta)/2a
x=-b/2a
x=2/2
x1=x2=1
tga=1
sena/cosa=1
sena=cosa
a=45º=pi/4
a=180+45=225º=5pi/4
somando as duas
pi/4+5pi/4
6pi/4
3pi/2