When first learning about the
Trigonometric Ratios, you will be working in
Degree mode. The calculator will default to
Radian mode, so ....

start by setting the
calculator's MODE to
Degree!!!!

Note: If the
calculator is set in Radian
mode and you wish to find an angle in
Degrees, you can insert a
degree symbol after the number of degrees in the angle.
The degree symbol is found under
2nd APPS(Angle) #1 °.
Only that one entry will be calculated in
Degrees -- all others will
remain inRadian mode.

Find sin 35°

Set
MODE to
Degree

Type entry on the Home Screen

You may be asked to round this answer to
a specified value.

If not asked to round, state the full
value as the answer.

If further calculations are needed, keep
this full calculator value and continue
working.

Find <A to the nearest degree,
given cos A = 3/5

Set MODE to
Degree

Type entry on the Home Screen.
Hit 2nd cos to get
the cos^{-1}