Find the partial derivative of z with respect to x (32) for z = (3x² + 1) cos(x²y) O None of the choices dz = −2x (3x² + 1) sin(x²y) + 6xcos (x²y) dx : −2xy′ (3x² + 1) sin(x²y) — 6xcos (x²y) əx dz : −2xy (3x² + 1) sin(x²y) + 6xcos (x²y) əx = −2x (3x² + 1) sin(x²) + 6xcos (x²) əx

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