If you have the time,

So i want to convert this polar equation to a rectangular form.

Problem1: r= 4cosθ - 4sinθ

I understand the simple conversions like this one:

r= 3secθ

r/secθ = 3 (divided secθ)

rcosθ = 3 (1/secθ = cosθ)

x = 3 : rcosθ = x (coordinate conversion equations)

but i dont know how to begin with the problem 1

Here are other coordinate conversion equations that might help:

y = rsinθ

r^2 = x^2 + y^2

tanθ = y/x

thankyou!