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OpenStudy (anonymous):
which of the following are identities (choose all that apply) a. sin3x-sinx/cos3x + cosx = tanx b. (sinx + cosx)^2 =1+ sin2x c. sin3x/sinx cosx = 4cosx - secx d. sin6x = 2sin3x cos3x
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OpenStudy (anonymous):
b is the one because it uses the identity sin^2x+cos^2x=1
OpenStudy (anonymous):
ALL R IDENTITIES
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