Trigonometric Functions - Sharp EL-9900C User Manual

TRIGONOMETRIC FUNCTIONS

The definitions of the trigonometric functions with regard to the right triangle
can be used to find distances between points. The sine function is defined to be
opposite side/hypotenuse, the cosine function is adjacent side/hypotenuse, and
the tangent function is opposite side/adjacent side.
Put the calclator in degree mode by pressing 2ndF
1. Find sin 30°.
STEP 1:
STEP 2:
STEP 3:
2. Find 3cos 20°.
STEP 1:
STEP 2:
3. Find tan 50°.
STEP 1:
STEP 2:
Remember that cotangent = 1/tangent, secant = 1/cosine, and
cosecant = 1/sine.
Basic Keyboard/GENERAL MATHEMATICS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
hypotenuse
adjacent side
+ –
Press to access the calculation screen.
×
÷
Enter sin 30 by pressing MATH
Calculate by pressing the ENTER key.
The answer is 0.5.
Enter 3 cos 20 by pressing 3
Calculate by pressing the ENTER key.
The answer is 2.819
Enter tan 50 by pressing MATH
Calculate by pressing the ENTER key.
The answer is 1.19.
opposite side
θ
SETUP
Α
1
Α
MATH
Α
3
8
B 1 .
0 .
3
2
2 0 .
0 .
5