作业帮若cos(π/4+x)=3/5,17π/12
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若cos(π/4+x)=3/5,17π/12
若cos(π/4+x)=3/5,17π/12
若cos(π/4+x)=3/5,17π/12
先确定π/4+x的范围 20\12π<π/4+x<2π在第四象限
所以 像素太低 崩溃了 这张是最清楚的了
cos(π/4+x)=3/5,17π/12
cos(π/4+X)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17/12π
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,-17π/12
若cos(x+y)=4/5,cos(x-y)=-4/5,且3π/2
若cosx=2/3,x是第四象限角,求sin(x-2π)+sin(-x-3π)cos(x-3π)/cos(π-x)-cos(-π-x)cos(x-4π)的值
三角函数解方程 (cos 3x)^3+ (cos 5x)^3 = 8 (cos 4x)^3 (cos x)^3
若cos(π/4+x)=3/5 17π/12
若cos（π/4+x）=3/5,17/12π
若cos(π/4+x)=3/5,17π/12
若cos(π/4+x)=3/5,17π/12
若cos(π/4+x)=3/5 17π/12
若cos(π/4+x)=3/5 17π/12
若cos（π/4+x)=3/5,17/12π