證明![{\displaystyle \ tan{\frac {\theta }{2}}={\frac {1+sin\theta -cos\theta }{1+sin\theta +cos\theta }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/1f93582e22db8d6e8858fde543a394ff3891375a)
右式![{\displaystyle \ ={\frac {1+sin\theta -cos\theta }{1+sin\theta +cos\theta }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/97f64a731499e54c240dbba3e58f31b06747bc86)
- 上下同乘(1+sinθ-cosθ)/(1+sinθ-cosθ)
![{\displaystyle \ ={\frac {1+sin\theta -cos\theta }{1+sin\theta +cos\theta }}\times {\frac {1+sin\theta -cos\theta }{1+sin\theta -cos\theta }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/cc0eaa317cf85d28edc682a5038762ade3ff9637)
![{\displaystyle \ ={\frac {(1+sin\theta )^{2}-2cos\theta (1+sin\theta )+cos^{2}\theta }{(1+sin\theta )^{2}-cos^{2}\theta }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4497b0dccd95f927415fdfc8f8b6048d9a10cada)
- 將
換成![{\displaystyle 1-sin^{2}\theta }](https://wikimedia.org/api/rest_v1/media/math/render/svg/bd082a51c3a0e93011066dacef067920f55ba412)
- 將
拆開成![{\displaystyle (1-sin\theta )(1+sin\theta )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/51a2b6303d6d7b309fcc223b0e8fd8b31804372b)
- 其實這就是
![{\displaystyle tan{\frac {\theta }{2}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/56df080673a5d253244a4cb35115dd67569c1937)
棒球術語[编辑]
- Hits per Nine Innings 被安打率
- Walks Plus Hits per Inning Pitched 每局被上壘率
- Batting Average on Balls put Into Play 場內被安打率
- Walks per Nine Innings 保送率
- Opponent On-base Plus Slugging 被攻擊指數
- Inning per Game Started 平均先發局數
- Total Bases On Safe Hits 壘打數
- Balls put Into Play percentage 將球打進場內機率
- On-base percentage Plus Slugging Percentage 整體攻擊指數
- =Gross Production Average 整體攻擊指數(平衡過的)=
- probability of a successful steal 盜壘成功率
皆適用[编辑]
- Batting Park Factor 球場校正值
逼近0[编辑]
現在*3
PVC聚氯乙烯[编辑]
- 乙烯與氯氣在三氯化鐵催化下加成生成1,2-二氯乙烷
- 精製後的1,2-二氯乙烷發生裂解,生成氯乙烯和氯化氫
未知化合物[编辑]
微積分[编辑]
![{\displaystyle \ {\sqrt {2}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d02e559fd17375d47ee8e0b3467d876e36be0653)
![{\displaystyle \ {\sqrt {2+{\sqrt {2}}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/fa9844c29f848742d31d013cbc1e179d09f39414)
![{\displaystyle \ {\sqrt {2+{\sqrt {2+{\sqrt {2}}}}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5a31e1a14ede33accfa3e0da1370bdcad08817c7)
![{\displaystyle \ {\sqrt {2+{\sqrt {2+{\sqrt {2+{\sqrt {2}}}}}}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b3478261abb1b31edf88d1de1a2b2355787db5e5)
物理實驗[编辑]
,
,
,
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正切半角[编辑]
設
= t
MOSFET[编辑]
feedback control 4.16 d[编辑]
sys[编辑]