exam Maths Puzzle Numerical Ability

if f(x)=3sinx + 2cos2x, the value of (Pie/2) is

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Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle. Thank you in advance for the help! there are 4 positions with 6 people to fill. How many different ways can the officers be elected?