Question

Question #b46d3

Answer 1

See below

Explanation:

`sin(45)=sin(90/2)`

`sin(\theta/2)=+-sqrt((1-cos\theta)/2)`

`sin(90/2)=+-sqrt((1-cos90)/2)=+-sqrt(1/2)=1/sqrt(2)=sqrt(2)/sqrt(2)^2=sqrt(2)/2`

`sin(45)=sqrt(2)/2`