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Mathematics
Trigonometry
Trigonometric Identities

what's the single trig. function of cos6xcosx-sin6xsinx

1 answer
asked by MIK
11 years ago
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recall

cosAcosB - sinAsinB = cos(A+B)
then
cos6xcosx - sin6xsinx = cos(6x+x) = cos(7x)

answered by Reiny
11 years ago
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2. 0

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