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(Cos2x)/4+3/4是如何转变成(1+Cos4x)/8+3/4的?请...

4. (sinx)^4 = (sinx^2)^2 = ((1 - cos2x)/2)^2 = (1 - 2cos2x + (cos2x)^2)/4 = 0.25 - 0.5cos2x + 0.125(1 + cos4x...

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