10 to the zero power times 2 to the 1 power

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Which value is not a solution of 8x^3 – 1 = 0

Find cot x if sin x cot x csc x = √2