Question

Question #06ba6

Answer 1

See below.

Explanation:

`cos 60^@ = 1/2`
`sin 60^@ = sqrt3/2`

then

`(cos60-sin60)/(sin60+cos60) = (1-sqrt3)/(1+sqrt3) = (1-sqrt3)^2/(-2) = -1/2(4-2sqrt3) = sqrt3-2`