已知sin(a-π/4)=-根号2/10,0

已知sin(a-π/4)=-根号2/10,0 已知sin a-cos a=根号2,且0 已知sin(3π-a)= 根号2sin(π-β),根号3cos(-a)= -根号2cos(π+β),且α β属于(0,π 已知sin(3π -a)=根号2sin(2π +b),根号3cos(-a)=-根号2cos(π +b)且0 已知sin(π/6+a)=（根号3）/3,求sin(2π/3+a)? 已知向量a=(根号2sin(4/π+x)+1,-根号3),b=(根号2sin(4/π+x)-1,cos2x函数f(x)= 已知sin(A+π/4)=7根号2/10,A属于(π/4,π/2)求cosA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sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2 已知sin(a+π/3)+sina=-4根号3/5 -π/2 已知sin(a+π/3)+sina=-4根号3/5,-π/2 已知sin(45度-a)=根号2／10且0度