1-6 Evaluate the integral by making the given substitution. 1. fcos 2x dx. u-2x 2. fx(2x²+3) dx, u= 2x² + 3 3. fx²√x³ + 1dx, u=x² +1 4. f sin³0 cose de, usin 5. S √(x² =²57² d dx, u-x-5

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