三角函数已知P(-4,3) 求(cos((π/2)

三角函数已知P(-4,3) 求(cos((π/2)+x)sin(-π-x))/(cos((11π/2)-x)sin((9

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三角函数已知函数f(x)=cos（ 2x - π/3）+2sin( x – π/4 )sin( x + π/4 )(1)
已知 f(x)= sin(x-3π)•cos(2π-x)•sin(-x+ 3π 2 ) cos(-x-π)•cos( π
已知f(x)＝sin(x−3π)•cos(2π−x)•sin(−x+3π2)cos(−x−π)•cos(π2−x)
已知函数f(x)= [sin(2π-x)sin(π+x)cos(-x-π)] ／[2cos(π-x)sin(3π-x)]
若sin(x-π)=2cos(2π-x),求(sin(π-x)+5cos(2π-x))/(3cos(π-x)-sin(-
已tanx=4/3,求cos(2x-π/3)cos(π/3-x)-sin(2x-π/3)sin(π/3-x)
已知sin(x+π/3)=1/4,求sin(2π/3-x)+cos²(π/6-x)
已知cos（π/4-x）=-3/5,求sin2x/sin（x+π/4）
f(x)sinx·sin(π-x)+√3sin(π/2+x)cos(π/2+x)+2cos(π+x)cos(π-x) 求
已知f（x）=sin(5π2+x)cos(x−π2)•sin（x+π）•cos（π-x）．