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ArCtAn0.25是几度?

解: 设arctan0.25等于x度,依据题意有, arctan0.25=x 则,tgx=0.25,查三角函数表,得: x≈14.04 答:arctan0.25约等于14.04度.

arctanx+arctan0.25x=39 arctan(x+0.25x1-0.25x²)=39 arctan(5x/4-x²)=39 5x=tan39(4-x²) tan39x²+5x=4tan39 解方程x≈0.5912172

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