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*co...