What is the function of the sin to the cosine if 69+420 is equal to 0 divided by zero?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Use the graph of the sine function y=2sinθ shown below

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.