x = cos t
y = cos 2t
d^2y/dx^2 = ?
( 附註 sin t 不等於 0 )
( A ) 4 cos t
( B ) 4
( C ) 4 y/x
( D ) - 4
( E ) - 4 cot t
求導 d^2y/dx^2
2009-09-19 7:21 pm
回答 (1)
2009-09-19 9:26 pm
收錄日期: 2021-04-22 00:45:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090919000010KK02949