Question

integral of 2 cos (theta/2)???

I dont really get why it is 4sin(theta/2)...

Answer 1

@mathstudent55

Answer 2

this is a standard integration
\[\int\limits_{}^{}\cos(ax)dx=\frac{ 1 }{ a }\sin(ax)+c\]

Answer 3

wouldnt that be just sin(theta/2)? because the 1/2 cancels...

Answer 4

so....
\[\int\limits_{}^{}2 \cos(\frac{ \theta }{ 2 })d \theta=2\int\limits_{}^{}\cos \frac{ \theta }{ 2 }d \theta\\=2*\frac{ \sin \frac{ \theta }{ 2 } }{ 1/2 }+c\]
ok?

Answer 5

got this?

Answer 6

ok, i think that makes sense

Answer 7

yea, I think so

Answer 8

good :)