Question 3 - A-Level Maths

Find $\int 4 \cos \left( \frac { 1 } { 3 } x + 2 \right) \mathrm { d } x$.
Use the trapezium rule with three intervals to find an approximation to $$\int _ { 0 } ^ { 12 } \sqrt { } \left( 4 + x ^ { 2 } \right) \mathrm { d } x$$ giving your answer correct to 3 significant figures.