化简:2sin^4x+3\4sin^2(2x)+5cos^4x-1\2(cos4x+cos2x)
问题描述：
化简:2sin^4x+3\4sin^2(2x)+5cos^4x-1\2(cos4x+cos2x)
答
2sin^4x+3\4sin^2(2x)+5cos^4x-1\2 (cos4x+cos2x) =2sin^4x+3\4sin^2(2x)+5cos^4x-1\2【cos^4(x)+sin^4(x)-6sin^2(x)cos^2(x)+cos^2(x)-sin^2(x)】=【3/2sin^4(x)+6sin^2(x)cos^2(x)+9/2cos^4(x)】 - 1/2 cos^2(x) +...