Question

Question #f0bb6

Answer 1

`cos(x/2)=0.894`
`sin(x/2)=-0.447`

Explanation:

`tanx=-4/3`
or
`x=tan^-1(-4/3)`
or
`x=-53.13`
or
`x/2=-26.57`
So
`cos(x/2)=cos(-26.57)`
`cos(x/2)=0.894`===============Ans `1`

`sin(x/2)=sin(-26.57)`
`sin(x/2)=-0.447`===============Ans `2`