What is expand acos(ωt-kx)+acos(ωt-k(x+δx)) ?

The solution to expand acos(ωt-kx)+acos(ωt-k(x+δx)) is acos(ωt-kx)+acos(ωt-kx-δkx)

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expand acos(ωt-kx)+acos(ωt-k(x+δx))

expand

a cos (ω t - k x) + a cos (ω t - k (x + δ x))

a cos (ω t - k x) + a cos (ω t - k x - δ k x)

Solution steps

a cos (ω t - k x) + a cos (ω t - k (x + δ x))

Expand

ω t - k (x + δ x) : ω t - k x - δ k x

= a cos (ω t - k x) + a cos (- k x - δ k x + ω t)

e (\frac{- π + 1 + π ^{2}}{π ^{2} - π} - 1)

\frac{k ( s + 1 )}{s ^{2} ( s + 10 ) ( s + 100 )}

\frac{1 - e ^{- 2 s}}{s ( s ^{2} + 4 )}

H (x - 2) (t - 2)^{2}

\frac{4 e ^{- s} - 2 s e ^{- s} - s ^{2} + s}{s ( s - 1 )}

What is expand acos(ωt-kx)+acos(ωt-k(x+δx)) ?
The solution to expand acos(ωt-kx)+acos(ωt-k(x+δx)) is acos(ωt-kx)+acos(ωt-kx-δkx)