Math
posted by Abby on .
tan(x)=5 sin(x) for interval π < x < π

tan(x)=sin(x)/cos(x)
sin(x)/cos(x)=5sin(x) Divide withsin(x)
1/cos(x)=5
1=5*cos(x) Divide with 5
cos(x)=1/5
cos(x)=0.2
OR
1/cos(x)=5
sec(x)=5 
The only choices were A) 0, 1.571 B) 1.571, 0, 1.571 C) 1.369, 0, 1.369 D) 0, 1.369

tan(0)=0
sin(0)=0
tan(0)=5*sin(0)
0=0
arccos(0.2)=1.3694384 radians
tan(alpha)= tan(alpha)
sin(alpha)= sin(alpha)
tan(1.3694384)=5 sin(1.3694384)
Answer C) C) 1.369,0,1.369 is correct