sin^2(兀/8)-cos^2(兀/8)
三角化简sin(x-5兀)cos[(-兀/2)-x]cos(8兀-x)/sin[x-(3兀/2)]sin(-x-4兀)
化简 cos(@-兀/2)/sin(5兀/2+@)*sin(@-2兀)*cos(2兀-@)
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)
已知sinαcosα=1/8,且α是第三象限角,求(1-cos^2 α)/(sinα-cosα)-(sinα+cosα)
2sin@+cos@等于?
已知a(-0,兀且2SIN A-SIN ACOS A-3COS A=0求SIN(+兀/4)/SIN 2A+COS 2A+
【1】化简:sin(a-5π)/cos(3π-a)×cos(π/2-a)/sin(a-3π)×cos(8π-a)/sin
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-
Sin兀/2等于多少?cos兀/2等于多少
cos(兀-1)-sin(1-兀/2)=多少
化简sin(兀+a)cos(3/2兀+a)+sin(兀/2+a)cos(兀+a)=
化简:[1+2sin(α+2π)*cos(α-2π)]/[sin(α+4π)+cos(α+8π)]