abigailturner1202 abigailturner1202

Today at 4:02 AM
Mathematics

Answered

find the expression as the cosine of an angle
cos pi/4 cos pi/9 - sin pi/4 sin pi/9

Answer :

StrugglingBean StrugglingBean

Today at 4:07 AM

Answer: cos(13pi/36)

Step-by-step explanation: just did the assignment

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