Chapter 5 notes for 11th grade Honors Precalculus from an A+ student. Includes definitions on course materials, graphs displaying concepts, numerous example problems including answers, equations, and step-by-step instructions designed to make learning a breeze! Chapter features 2 moduels, includin...
Example
53
We know that cos 300=-2 .
Obtain this exact value
using cos 300 =
cos ( 900 600 )
-
and the difference formula for cosines .
Costa B )
cosdcosB-isindsin.BR
-
- -
B
900cos 600 900 sin 600
'
l
cos
-
+
sin l
E is
Ez )
'
(
-
)
3=0
=
(O .
z + 1. 3
I
+ 2
53
-
=
2 53
-
3
- E
3
I 1
r
Example us
Find the exact value of cos 700 cos 400-1 sin 705in 400
Costa B ) Costco SB + Sind sin .B
-
- -
cos (700-400) 1300 )
-
cos
-
is
= 2-
Sum and Difference Formulas for Cosine and sines
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