Mathematics, 06.12.2021 23:50, tay9625

Can somebody please explain why y = -x is equivalent to r sin(θ) = r cos(θ) instead of r sin(θ) = - r cos(θ) ? Thank you.

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Can somebody please explain why y = -x is equivalent to r sin(θ) = r cos(θ) instead of r sin(θ) = -...