化简【完整步骤!】1.（sin^4x-sin^2x）/secx2.sin^4x-cos^4x【这道题的正确答案是sin^2x-cos^2x】

化简【完整步骤!】1.（sin^4x-sin^2x）/secx2.sin^4x-cos^4x【这道题的正确答案是sin^2x-cos^2x】 已知sin(x+pai/5)=1/4 则sin(6pai/5+x)+cos2(pai/5-x)=额 只需要把cos2(pai/5-x)的化简步骤写出来就可以了 麻烦一定要完整 y=sin(1/2x-π/6) x属于 [-π/3,-π ]的定义域 要完整的步骤 化简 (sin π/4 cos x)ˆ2-(cos π/4 sin x)ˆ2化简sin(π/4+x)sin(π/4-x)展开后化成这步骤，下步怎么化 方程组X/4+Y/3=7,2/3X+1/2Y=14求完整步骤要求完整步骤 4X+48=(4+2)X-8怎么解要是完整步骤 因式分解x²-y²+6x-4y+5要求步骤完整,别跳步 3x²＋6x－4公式法完整步骤 2x的平方-4x+1=0 最好是给完整步骤 化简sin(x+7π/4)+cos(x-3π/4）步骤我已经找到撒sin(x+7π/4)+cos(x-3π/4)=sin(x+2π-π/4)+cos(x-π+π/4)我问下这一步是在干嘛?=sin(x-π/4)+cos[-(π-x-π/4)]=sin(x-π/4)+cos(π-x-π/4)=sin(x-π/4)-cos(x+π/4)=sin(x-π/4)-cos(x+π/2- 已知函数f（x）=2sin方π/6x+sin（π/3x+π/6）—1 求f（x）的值域要求步骤完整 s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)用matlab画图,求教啊 f(x)=2cos2x+sin^2x,化简.详细步骤! ∫x(1-x^2)½dx完整步骤, f(x)=e^sin(3x-4),求dy,要具体的步骤, 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简(1-sin^2x)tanx详细步骤及公式来源.