数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简?

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数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简?
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数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简?
数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简?

数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简?
给你发图片吧,还是手写快,哈哈

[tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)]
通分得
{[tan(x/2) +1 ]^2+[tan(x/2) - 1]^2}/{[1 - tan(x/2)] [1 + tan(x/2)] }
={[tan(x/2) +1 ]^2+[tan(x/2) - 1]^2}/【1-tan^2(x/2)】
=【2tan^2(x/2)+2】/【1-tan^2(x/2)】
=2[tan^2(x/2) +1 ]/【1-tan^2(x/2)】