Verify the identity. (Simplify at each step.) 3 cos(x + y) cos(x - y) = 3 cos(x) - 3 sin²(y)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.3: Trigonometric Functions Of Real Numbers
Problem 41E
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Clearly fill in every blank. Thanks. 5.4
Verify the identity. (Simplify at each step.)
3 cos(x + y)cos(x - y) = 3 cos(x) - 3 sin²(y)
3 cos(x + y)cos(x − y) = 3(cos(x)cos(y) -
= 3
3 cos²(x)cos²(y) - 3 sin²(x)
=
- 3 cos²(x)(1-
= 3 cos²(x) - 3 cos²(x)(
= 3 cos²(x) - (
= 3 cos²(x) - 3 sin²(y)
)
))(
3 sin²(x)
)- 3 sin?(x)(
)(cos²(x) + sin²(x))
) + sin(x) sin(y))
Transcribed Image Text:Verify the identity. (Simplify at each step.) 3 cos(x + y)cos(x - y) = 3 cos(x) - 3 sin²(y) 3 cos(x + y)cos(x − y) = 3(cos(x)cos(y) - = 3 3 cos²(x)cos²(y) - 3 sin²(x) = - 3 cos²(x)(1- = 3 cos²(x) - 3 cos²(x)( = 3 cos²(x) - ( = 3 cos²(x) - 3 sin²(y) ) ))( 3 sin²(x) )- 3 sin?(x)( )(cos²(x) + sin²(x)) ) + sin(x) sin(y))
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