1. 2-15-18 T2.1 d To Use The Calculator To Find All Trig Values
Got ID?

2. Class opener: Find all six trig functions ( in EXACT value), given the following information:
III II -5 17

3. Active Learning Questions?
III II

4. LESSON : Using calculators.
***First, make sure your calculator is in degree mode (DRG button, select DEG, hit ENTER)***
Find sin 73° on your calculator to 4 decimal places.
If you have a single line calculator, your function goes in after the angle: “73 sin”
Put an ANGLE into the function,
get a RATIO out!
Find:
1. sin (-157°)
2. cos 0.123°
3. tan 583°
Use the negative sign, not subtraction.
I prefer to close my parentheses

5. What about DMS?
(4 decimal places)
Try: 1. cos 152° 17’
2. tan 68° 55’

6. We’ve looked at negative and we’ve looked at DMS, what about a negative angle that is in DMS? (4 decimal places)
But is this NOT correct? Why not?
There is a difference!
But these are the same!

7. To find cotangent, secant, and cosecant, remember that they are reciprocal functions for tangent, cosine, and sine: *
Let’s look at
sec 165°
You may use parentheses or not, the calculator will take the function, first

8. Try these (4 decimal places):
sec (-58°)
cot 17° 34’
csc (-128° 43’)

9. Find the sin 3.8 (What do you notice about this???)
Change your calculator to radians: DRG button, select RAD, hit ENTER
Try (4 dec. pl.): tan (-5.1) sec (-1.9)

10. Active Learning Assignment: p. 280: 5-10 (a & b only) p
Active Learning Assignment: p. 280: 5-10 (a & b only) p. 285: 1, 2 TEST on T2.1a, T2.1c, T2.1d, T2.1e & T2.1f on (3 x 5 card, only)
2 WOW’s:
Don’t major in minor things—let it go.
Praise in public, criticize in private.