已知sin(π/4-x)=5/13,且0
已知sin(π/3-x)=-1/5,且0
已知sin(π/4-x)=-1/5,且0
已知sin[(π/4)-x)]=5/13,0
已知sin(a+x)=4/5,且sinacosa<0,求[2sin(a-π)+3tan(3π-a)]/4cos(a-3π
已知x∈(0,4分之π),且sin(4分之π-x)等于13分之5,求cos(4分之π+x)分之2x求...
已知sin(π/4-x)=12/13,0
已知sin(x+30)=12/13,且60
1.已知sin(X/2)=(4/5),且X∈(π/2 ,π),求sinX ,cosX的值.
已知sin(TT/4+x)=5/13,0
已知函数f(x)=2sin(x/4)cos(x/4)-2√3sin²(x/4)+√3,且g(x)=f(x+π/
已知向量a=[cos(3x/2),sin(3x/2)],b=[cos(x/2),-sin(x/2),]且x∈[0,π/2
已知向量a=(cos(3x/2),sin(3x/2)),b=(cos(x/2),-sin(x/2)),且x∈[0,π/2