What is expand cos(kx-wt)+cos((k+dk)x-(w+dw)t) ?

The solution to expand cos(kx-wt)+cos((k+dk)x-(w+dw)t) is cos(kx-wt)+cos(kx+dkx-wt-dwt)

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expand cos(kx-wt)+cos((k+dk)x-(w+dw)t)

expand

cos (k x - wt) + cos ((k + d k) x - (w + d w) t)

cos (k x - wt) + cos (k x + d k x - wt - d wt)

Solution steps

cos (k x - wt) + cos ((k + d k) x - (w + d w) t)

Expand

(k + d k) x - (w + d w) t : k x + d k x - wt - d wt

= cos (k x - wt) + cos (k x + d k x - d wt - wt)

(y^{\frac{1}{2}} + 1)^{2}

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25 (1 - sin (2 x))

(e^{- x} cos (e^{- x}) - sin (e^{- x})) e^{2 x}

C (4, - 5) r^{4}

What is expand cos(kx-wt)+cos((k+dk)x-(w+dw)t) ?
The solution to expand cos(kx-wt)+cos((k+dk)x-(w+dw)t) is cos(kx-wt)+cos(kx+dkx-wt-dwt)