sin^6+COS^6===
sin^6+COS^6===
sin^6+cos^6====
sin^6+cos^6====
數(shù)學人氣：454 ℃時間：2020-05-25 05:35:16
優(yōu)質(zhì)解答
sin(x)^6+cos(x)^6 ＝[sin(x)^2+cos(x)^2]*[sin(x)^4-sin(x)^2*cos(x)^2+cos(x)^4] ＝sin(x)^4+2*sin(x)^2*cos(x)^2+cos(x)^4-3*sin(x)^2*cos(x)^2 ＝[sin(x)^2+cos(x)^2]^2-3*sin(x)^2*cos(x)^2 =1-3*sin(x)^2*cos(x)^2 =5/8+3/8*cos(4*x)
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