Question

What is the distance between `(2 , (5 pi)/8 )` and `(-1 , (2 pi )/3 )`?

Answer 1

`=sqrt((5+4cos(pi/24))` unit

Explanation:

Distance `=sqrt(r_1^2+r_2^2-2r_1r_2cos(theta_1-theta_2))`
`=sqrt((2)^2+(-1)^2-2*2*-1*cos(5pi/8-2pi/3))`
`=sqrt((5+4cos(pi/24))`