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NguyÔn Quang §«ng. §H Th¸i Nguyªn Mobile: 0974974888<br />
⎛ d1−<br />
d2<br />
∆ϕ<br />
⎞<br />
Biªn ®é dao ®éng t¹i M: AM<br />
= 2Acos⎜π<br />
+ ⎟<br />
⎝ λ 2 ⎠ víi ∆ ϕ = ϕ1−<br />
ϕ2<br />
l ∆ϕ<br />
l ∆ϕ<br />
Chó ý: * Sè cùc ®¹i: − + < k