Graph the equations in Exercises 17–24 in the θr-plane. Label each arc of your curve with the quadrant in which the corresponding polar graph will occur. 17. r = 1 − cos θ18. r = 1/2 − sin θ19. r = 2 + sin θ20. r = sin 2θ21. r = cos2 θ22. r = θ, r ≤ 023. r = sec θ24. r = 1 + sin 3θ

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Q: If sec 4θ = csc(θ+20), then θ is equal to?

A: topic - trigonometric identities