Solving trig expressions

[TitanMath]

Ok, I am new here and new to the idea of trig so bare with me here.

I'm completely lost on my homework. Any help on these following problems would be appreciated.

Find the value of each expression rounded to two decimal places using your calculator

67. inverse sec(4)

68. inverse csc(5)

69. inverse cot(2)


Now I know it says to "use your calculator", but I see no "sec", "csc", or "cot" buttons on my calculator. We were given a set of rules to follow (i.e. sin= 1/csc) but I am not sure how to apply them here. Any well would be greatly appreciated. Thanks.

 

[royhaas]

Here's a hint: \(\displaystyle csc^{-1}(x) = sin^{-1}(1/x)\). You should be able to prove this from the definitions.