How do you evaluate #Tan^-1(2.8/4)#?
The question is asking for the size of the angle which will have the length of the opposite side as 2.8 and the adjacent side 4.
This can only be done by using a calculator or from tables.
On a calculator use the shift/alt/2nd function key and the
This is another way of saying that in a right-angled triangle with an angle of 35.0°, the opposite side will be 70% of the length of the adjacent side.