若sina+f(a)=2/3,f(a)=sin(a+π/2),求(√2sin(2a-π/4)+1)/(1+tana)的值

若sina+f(a)=2/3,f(a)=sin(a+π/2),求(√2sin(2a-π/4)+1)/(1+tana)的值 已知tana=2 求sin²a-sina*cos(a-4π)+2的值 函数f(x)=(1+1/tanx)sin^2x-2sin(x+π/4)sin(x-π/4).若tana=2,求f(a). 已知tana=2,求下列各式的值（1）2cosa-√2sina/2cosa+√2sina (2)3sin平方a-4sin 已知函数f(x)=(1+1/tanx)sin^2-2sin(x+π/4)sin(x-π/4).求tana=2时,f(a) 已知tana/tana-1=-1,求下列各式的值（1）sina-3cosa/sina+cosa(2)sin^2a+sin f(x)=(2cos^2 a/2-sina-1)/(sin(a+π/3)sin(a-π/3) 已知tan{π/4+a}=3,求sina*sin(3π /2 +a)-sin^2a+1的值 已知sin(a/2)=4/5,a∈(π,2π),求sina,cosa,tana. 已知sin(a/2)=4/5,a∈(π,2π),求sina,cosa,tana 已知tana=1/2 求 sin^2a+sina+2的值 已知tana=1/2求下列各式的值 sin^2a+sina*cosa+2