化简cos2χ·tan(π\4+χ)除以cos^2(π\4-χ))
可以详细点不-
人气:484 ℃ 时间:2020-03-13 15:09:15
解答
答案为2由半角公式:(注意π/2+2x=2*(π\4+χ))tan(π\4+χ)=(1-cos(π/2+2x))/sin(π/2+2x)=(1+sin2x)/cos2x……(1);cos^2(π\4-χ)=(1+cos(π/2-2x))/2=(1+sin2x)/2……(2);代入原来的计算时即可答案为2...
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