Calculate the value of the line's slope and report it at the accuracy of one decimal place, when it is known that the directional angle of the line is

a) [[$ 25° $]].



Answer: The slope of the line is .

b) [[$ 80° $]].



Answer: The slope of the line is .

c) [[$ 48° $]].



Answer: The slope of the line is .

d) [[$ 90° $]]



Answer: The slope of the line is ?.