數學-excel

2007-10-03 5:43 am

大家都應該知道,tan 45 = 1
但係我試過用excel 計 tan 45
發覺並唔得於 1
於是再試埋 sin 同 cos
都係出唔到計數機既答案

有冇人可以話我知點解丫?

回答 (3)

2007-10-03 11:32 pm

✔ 最佳答案

You have to use radians to let computer know 45 is a degree not a number, see below.

=TAN(RADIANS(45))

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2007-10-03 7:55 am

因execl用radians來計算的，所以 tan45度要用 tan(45x3.1415926/180)才正確。

=TAN(45*PI()/180)

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2007-10-03 5:50 am

我岩岩試過,tan45 not=1
tan45=

1.619775
可能tan45=1是一個近似值

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