Determine the derivative of f(x) = r² cosa- 2x sinx. 1 f'(x) = (x² + 2) sin x 2 f'(x) = -(x² + 2) sin r 3. f'(x) = (²-2) cos x 4 f'(x) = -(x²-2) sin a 5. f'(x) = (r2 +2) cost 6. f'(x)=-(²+2) cos x

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