Solve ( sin θ - 2r cos^2 θ) dr + r cos θ ( 2r sin θ + 1) dθ = 0 a. r sin^2 θ - r^2 cos^2 θ = c b. r sin θ - r cos^2 θ = c c. r sin θ - r^2 cos^2 θ = c d. none of the above

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