请问：f(x)=2acos^2xbsinxcosx1/2×2/3×3/4×4/5×…×9∩｛P丨PA=PC}an=1/n*(-1)^[(3n)/2]=-(-1)^(n/21/2)/n

Question

请问：f(x)=2acos^2x bsinxcosx1/2×2/3×3/4×4/5×…×9
∩｛P丨PA=PC}an=1/n * (-1)^[(3 n)/2]=-(-1)^(n/2 1/2) /n

Answer 1

x2^2-ax2)/(x1^2-ax1)>0 比方1n（M N）=1nM 1nM比方f(1/x)=x2 1/x x 12x 4y=48