Convert equations from polar to rectangular form (Part 2)

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Q. Convert the polar equation to a rectangular equation in x and y.

a) r=4 (Difficulty: Easy)

b) θ=3π/4 (Difficulty: Easy)

c) r=−2 sec⁡θ (Difficulty: Medium)

d) r=10 sin⁡θ (Difficulty: Medium)

What you'll need:

To go from polar to rectangular coordinates:

To go from rectangular to polar coordinates: