b. Inverse Trigonometric Functions and Second Function
The yellow key in the upper left of the calculator marked “2nd F" must be used to designate the
material appearing in orange above each key. When this key is pressed, the designation “2nd F“ will
appear in the upper part of the display. If you press this key in error, press it a second time and the
“ 2nd F“ designation will disappear.
Put the angular mode at “ DEG“
Key in: (2nd F) Sin-1 .5 C=D
Answer: 30 (Remember to use the second function key to get the inverse)
Put the angular mode at “ RAD“
Key in: (2nd F) Cos"1 GED 1 C=D
Answer: 3.141592654 (Value of n)
13
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