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4. : Integrals Involving Powers of Trigonom Evaluate the following integrals and check by differentiation: 3 1. S sin (2x) dx 4 2. S cost (3x) dx 5 3. J sin 60. cos 60. do 4. f sin* 50 . cos 50 . do 5. S sin (2x) cost (2x) dx