Question

Separation of variables. Differential equation.

Answer 1

separation is just algebra work ...
---------------------------

dr = b(cos(t) dr + r sin(t) dt)

dr/dt = b(cos(t) dr/dt + r sin(t))

dr/dt = b cos(t) dr/dt + br sin(t)

dr/dt - b cos(t) dr/dt = br sin(t)

(1 - b cos(t)) dr = br sin(t) dt

dr/r = (br sin(t))/(1 - b cos(t)) dt

Answer 2

Ohh. Thank you soo much =))

Answer 3

i hope you dont just copy it, but try to get it there and understand what i did.

good luck tho

Answer 4

Hahaha yes yes. i was just confused in the condition that b is a constant. =)