cos(π/4+x)=3/5,17/12π
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cos(π/4+x)=3/5,17/12πcos(π/4+x)=3/5,17/12πcos(π/4+x)=3/5,17/12π所求为：2cosx(sinx+cosx)cos^2x-----------
cos(π/4+x)=3/5,17/12π
cos(π/4+x)=3/5,17/12π
cos(π/4+x)=3/5,17/12π
所求为：2cosx(sinx+cosx)cos^2x
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(cosx-sinx)(cosx+sinx)
有条件只
π/4+x=2kπ+63°（特殊角度）
根据x的范围解得x的具体值,代入即可得出答案
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
三角函数解方程 (cos 3x)^3+ (cos 5x)^3 = 8 (cos 4x)^3 (cos x)^3
已知cos（x+45º)=3／5且17π/12＜x＜7π/4,求(sin2x+2cos²x)／1-tanx的值注意!括号里加的是cos^2x
cos(派/4+x)=3/5,17派/12
cos(pai/4+x)=3/5,17pai/12
cos(pai/4+x)=3/5,17pai/12
已知cos(π/4+x）=3/5,17π/12
已知cos(x+π/4)=3/5且17π/12
一、已知cos(π/4+x)=3/5,17π/12
已知cos（π/4+x）=3/5,17π/12
若cos(π/4+x)=3/5 17π/12