已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
(1)已知cos[(π/3)-a]=根号3/3,求sin[5π/6)-a]+sin^2[(2π/3)+a]的值
已知sin(A+π/4)+sin(A-π/4)=根号2/3 1.求sinA的值 2.求【sin(A-π/4)】/【1-c
已知tan a=3,求下列各式的值;(1)根号3 cos a-sin a/根号3 cos a+sin a (2)2sin
已知sin(3π+a)=2sin[(3π/2)+a],求sin^2a+sin2a的值
已知a属于(0,π/2),且2sin^2 a-sin a cos a-3cos^2 a=0,求SIN(a+兀/4)/SI
已知sin(a-3π)=2cos(a-4π),求(sin(π-a)+5cos((3π/2)-a))/(2sin(3π/2
已知方程sin(a-3π)=2cos(a-4π),求 [sin(π-a)+5cos(2π-a)]/[2sin(3π/2-
已知sin(阿尔法+π/3)=a,那么根号3sin阿尔法-cos阿尔法的值
已知sin(a+π/6)+cosa=4/5倍根号3,则sin(a+π/3)=
已知向量a=sin((a+π/6),1),b=(4,4cosa-根号3) a垂直b 则sin(a+4π/3)的值