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OpenStudy (anonymous):
write the expression as the sine, cosine or tangent of a single angle cos8x cos6x - sin8x sin6x
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random231 (random231):
this comes under the direct tansformation of cos(a+b)
OpenStudy (mathmale):
Does the following remind you of anything (a trig identity?) ??\[\cos a \cos b - \sin a \sin b\]
random231 (random231):
are you just here to get the answer? if that is so OS isnt the right place for you!
OpenStudy (dumbcow):
everything you need is right here http://en.wikipedia.org/wiki/Trig_identity#Angle_sum_and_difference_identities
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