f(t) = 2 sin 2t + cos 2t变成f(t)=a cos (bt + c)
1个回答
f(t)=√5·(1/√5·cos2t+2/√5·sin2t)
=√5·cos(2t-m)
【其中,cosm=1/√5,sinm=2/√5】
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