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OpenStudy (anonymous):
Use a half angle formula to fill in the blanks in the identity below: (cos(7x))^2
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OpenStudy (anonymous):
the blank is ___________+__________cos(________x)
OpenStudy (anonymous):
plz help me slove this question thanks much
OpenStudy (nikvist):
use \[\cos{14x}=\cos^2{7x}-\sin^2{7x}\]and\[1=\cos^2{7x}+\sin^2{7x}\]
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