sin(x＋π/4)＝5/13,x∈(π/2,3π/4),求sinx

sin(x+π/4) sin(x＋π/4)＝5/13,x∈(π/2,3π/4),求sinx 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 2sin(x+π/4)sin(x-π/4)=? sin(x+π/4)sin(x-π/4)等于什么? sin^2(π/4 +x) 已知sin(x+π/6)＝1/4求sin(5π/6-x)+sin²(π/3-x)在线等🙏 已知sin(π/4--x)=5/13,0 已知sin(π/4-x)=5/13,且0 sin(π/4-x)=5/13,则sin2x=? 求证:(sin 2x /(1-cos 2x) )·(sin x /(1+sin x))=tan (π/4-x/2). 已知sin(π／4－x﹚＝5／13,0＜x＜π／4,求[cos2x]／[cos﹙π／4＋x﹚]的值 x∈(π,3π/2),sin^4X+cos^4X=5/9,求sin^2X拜托各位了 3Q 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π) 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π) f(x)=（1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题, 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于?已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于（） A.-2009 B.-1/2009 C.1/2009 D.2009