MHF4U1-ASSIGNMENT CHAPTER 4B
NAME:_
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Which compound angle expression is equivalent to
a.
c.
b.
d.
?
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2. Which compound angle expression is equivalent to
a.
Section 5
Prove Trigonometric Identities
Chapter 4 Section 5
Question 1 Page 240
L.S. = cos 2 x
= cos( x + x )
= cos x cos x sin x sin x
R.S. = 2 cos 2 x 1
= 2 cos 2 x (sin 2 x + cos 2 x )
= cos 2 x sin 2 x
= cos 2 x sin 2 x
Since L.S. = R.S., cos 2x = 2