If p = acoswt+ bsinwt , where a and b are constant vectors and w is a constant
A)show that
dp
p * ---- is a constant vector ,and
dt
B)
d^2p
p * ---- = 0
d^2t
我試過很多代換
也有直接乘開也都不成功
不知道大大們有們有什麼想法可以提供我試試看
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