Asked by MIK
what's the single trig. function of cos6xcosx-sin6xsinx
Answers
Answered by
Reiny
recall
cosAcosB - sinAsinB = cos(A+B)
then
cos6xcosx - sin6xsinx = cos(6x+x) = cos(7x)
cosAcosB - sinAsinB = cos(A+B)
then
cos6xcosx - sin6xsinx = cos(6x+x) = cos(7x)
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