exam Maths Puzzle Numerical Ability

write each number in a form a/b using integers to show that it is a rational number

0.2

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exam Other Question

This is actually more trig. i think...

For a ball going around a unit circle with speed 1

(a) how long does it take for 5 revolutions
(b) at time t=3*pie*/2 where is the ball?
(c) at t=22 where is the ball (approximately) (sin(x+pi))/(cos(x-pi))