integration. evaluate each of
the following
6. S sec® (x) tan(x) dx 7. S sec" (x) tan(x) dx 8. ° 3z(x²+1) – 2x(x®+1) dx (x2+1)2 9. S4, 213 + sin(x) – 3x3 + tan(x) dx x 3 х