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How should I prove that the angle between the x-axis and the perpendicular line from the origin to the straight line of $$xcos\theta+ysin\theta=ρ$$ (ρ≥0) is the θ.

Can someone guide me through this proof, step-by-step?

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  • $\begingroup$ @CameronBuie I forgot to tell the question. sorry about that. $\endgroup$ – S.Ky Apr 12 at 12:14

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