计算cos^4(π/8)+sin^4(π/8)=____ 怎么做的?
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计算cos^4(π/8)+sin^4(π/8)=____怎么做的?计算cos^4(π/8)+sin^4(π/8)=____怎么做的?计算cos^4(π/8)+sin^4(π/8)=____怎么做的?c
计算cos^4(π/8)+sin^4(π/8)=____ 怎么做的?
计算cos^4(π/8)+sin^4(π/8)=____ 怎么做的?
计算cos^4(π/8)+sin^4(π/8)=____ 怎么做的?
cos^4(π/8)+sin^4(π/8)
=(cos^2(π/8)+sin^2(π/8))^2-2cos^2(π/8)sin^2(π/8)
=1-0.5sin^2(π/4)
=3/4
cos^4(π/8)+sin^4(π/8)=（cos^2(π/8)+sin^2(π/8)）^2-2cos^2(π/8)×sin^2(π/8)）＝1-2×(0.5sin(π/4))^2=1-2×（1／8）＝3／4＝0.75
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sin^4π/8-cos^4π/8=?