# Math Help - pre calc calculator stuff

1. ## pre calc calculator stuff

Hi, Im not sure how to solve these, although im pretty sure you do it all in the calculator... can someone help me out?

sec (arccos 2/3)

csc (arccot 3)

csc (arccsc 5)

thanks

2. Originally Posted by cokeclassic
Hi, Im not sure how to solve these, although im pretty sure you do it all in the calculator... can someone help me out?

sec (arccos 2/3)

csc (arccot 3)

csc (arccsc 5)

1. You are supposed to know that (for example) $\cos(\arccos(x))=x$
$\sec \left(\arccos \left(\frac23 \right) \right)=\dfrac1{\cos\left(\arccos \left(\frac23 \right) \right)}=\dfrac32$