3.34 * Use step-by-step propagation to find the following quantities (assuming that all given uncertainties are independent and random): (a) (20 +/- 1) [50 +/- 1) / (5.0 +/- 0.2)] (b) (20 +/- 1)* [(30 +/- 1) - (24 +/- 1)] c) (2.0 +/- 0.1) * tan (45 +/- 3º) [In part (c), the number 2 is exact.]