化简cos^4α/6-sin^4α/6

化简cos^4α/6-sin^4α/6 化简:sin(π/4-α)cos(π/3-α)-cos(π/6+α)sin(π/4+α)= 已知(sinα-cosα)/(sinα+cosα)=1/3,则cos^4(π/3+α)-cos^4(π/6-α)的值为 化简：sin^6α+cos^6α+3sin^2α*cos^2α=? 求（sin^6α+cos^6α）/（sin^4α+cos^4α）的值 1.化简sin²α+cosαcos(π/3+α)-sin²(π/6-α) 化简4sinα*cosα/sin²α-cos²α （急） 化简4sin²α-sinαcosα-3cos²α=0 已知tanα=3,求4sin²α+3sinα×cos+6cos²α的值. 1-sin^6a-cos^6a分之1-sin^4a-cos^4a 化简 化简1-sin^4a-cos^4a/1-sin^6a-cos^6a 已知tan²=3,求3cos²α-2sinα×cosα-4cos²α-6