若sin(π/2+x)=-4/5,x属于（π/2,π）,则cos(π/3-x)=

若x属于(0,π/2),且6 cosx=5 tan X,则sin X 若sin(π/2+x)=-4/5,x属于（π/2,π）,则cos(π/3-x)= 若x属于（π/2,π）,3cos2x=sin(π/4-x),则sin2x sin(π/4-x/2)=3/5 x属于(0.π/2)则tanx= 已知sin x=15/17,x属于π/2,π,求tan(π/4+x) 求下列函数周期 y=3sin(x/4) x属于Ry=2sin(2x-π/6) 若cos(π+x)=根号5/3且x属于(π/2,π),则sin(2π-x)= 若x属于（0,π/4）,求函数y=cos^2x-sin^x+2sinxcosx的值域 函数f(x)=(1+1/tanx)sin^2x-2sin(x+π/4)sin(x-π/4).若tana=2,求f(a).若x属于[π/12,π/2],求取值范围函数f(x)=(1+1/tanx)sin^2x-2sin(x+π/4)sin(x-π/4).若tana=2,求f(a).若x属于[π/12,π/2]求f(x)取值范围 很急很急,在线等 f(x)=2sin(π/2-x/2)*sin(π+x/2)+cos平方(π/2-x/2)-cos平方(π+x/2)f(x)=2sin(π/2-x/2)*sin(π+x/2)+cos平方(π/2-x/2)-cos平方(π+x/2) (1)若x属于（0,π/2）求f(x)最小值（2）设g(x)=f(2x-π/4）+2m,x属于｛π/4,7 y=sin(2x+π/6),x属于[π/6,3π/4],求值域 若函数f(x)= sin x+@/3,@属于( 0,2π )是偶函数,则@  x属于[0,2π],若7 sin(2x) = 7 cos(x) ,则X的值为多少 已知sinx=-5/13,x属于(派,3派/2),求sin(x-派/4) 若tan=1/2 x属于(0,1/4π) 则sin(2x+1/4π）= 已知x属于（π/4,π/2）sin（π/4-x）=-3/5 求cos2x的值 已知,x属于(π/2,π) sin=3/5 则tan(x+π/4）等于? 已知cosx=4/5,x属于(0,π/2),求tanx与sin(π-x)的值