Question

What is the distance between the following polar coordinates?: `(1,(7pi)/12), (3,(9pi)/8)`

Answer 1

`d~~3.28`

Explanation:

`d=sqrt(r_1 ^2-2r_1r_2cos(theta_1-theta_2)+r_2 ^2)`
`d=sqrt(1^2-2(1)(3)cos((7pi)/12 -(9pi)/8)+3^2`
`d~~3.28`