In Problems 5 to 8, evaluate the definite integrals. cos 4x cos 3x dx (a) or 0.4286 5. 6. 2 sin 7t cos 3r dr (0.5973] 7. sin 50 sin 20 de [0.2474] 8. 3 cos 8t sin 3r dr [-0.1999]

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