8
Advanced Keyboard/TRIGONOMETRY USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
To compute the inverse sine function in radians:
1. Turn the calculator on and press CL to access and clear the
home screen.
2. Change to radian mode by pressing 2ndF SET UP B (DRG)
and 2 (Rad). Press 2ndF QUIT to exit the menu.
3. Find sin
-1
(.4), press 2ndF sin
-1
• 4 ENTER . The answer of .4115
radians is shown below. To find the result in terms of π press ÷ 2ndF
π ENTER .
To graph the inverse cosine function in radians:
1. Press Y= CL to access and clear the Y1 prompt.
2. Enter cos
-1
x for Y1 by pressing 2ndF cos
-1
X/θ/T/n ENTER .
3. Set your viewing window by pressing ZOOM E (TRIG) and
5 (cos
-1
x).
INVERSE TRIGONOMETRIC FUNCTIONS
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