How do you evaluate using a calculator of #tan^-1(-1.7321)#?
This question is asking "What angle(s) has a tan value of
Step 1 . "In which quadrants is tan negative?"
From the CAST rule:
Step 2 . Find the root angle. Find
This gives the acute angle in the 1st quadrant from which we can get the angles in the other quadrants.
Step 3 Find the angles in the 2nd and 4th quadrants:
CHECK: use a calculator to verify that:
These are the angles for
Method shown below.
You will have to do a hunt on your key pad.
Using my now very outdated Casio fx-9700GE
Shift then tan
Do not use the 'minus' key but use the 'negative' key. On my machine designated as
After that I have to use the key marked 'EXE' . Yours may be labelled Ans
Whatever it is it is the one you would have to press make it solve something like 2+3