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数学
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若tana(a+b)=2/5,tan(a-π/4)=1/4,则tan(b+π/4)的值等于
人气:482 ℃ 时间:2020-04-26 12:33:42
解答
b+π/4=(a+b)-(a-π/4)
所以,tan(b+π/4)=[tan(a+b)-tan(a-π/4)]/[1+tan(a+b)tan(a-π/4)]
=(2/5-1/4)/(1+1/10)
=3/22
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