Sin^4a+Sina*Cosa+Cos^2a化简
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Sin^4a+Sina*Cosa+Cos^2a化简
Sin^4a+Sina*Cosa+Cos^2a化简
Sin^4a+Sina*Cosa+Cos^2a化简
Sin^4a+Sina*Cosa+Cos^2a
=(sin^2a)^2+1/2sin2a+1/2 (1+cos2a)
=[(1-cos2a)/2]^2+1/2sin2a+1/2 cos2a+1/2
=1/4 (1-2cos2a+cos^22a)+1/2sin2a+1/2 cos2a+1/2
=1/4cos^22a+1/2sin2a+3/4
=1/4(1-sin^22a)+1/2sin2a+3/4
=-1/4sin^22a+1/2sin2a+1
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