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Trigonometry help?

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Use the sum and difference identities to simplify this expression. 
. Cos 125 deg cos 65 deg + sin 125 deg sin 65 deg 
A. Sin 190 deg 
B. Cos 190 deg 
C. Sin 60 deg 
D. Cos 60 deg
 
 
asked Jul 16, 2014 in ALGEBRA 2 by anonymous
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1 Answer

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image

image

Apply the formula image

In this case image

image

image

Therfore image

Option D is correct answer.

answered Jul 16, 2014 by david Expert

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