Respuesta :

Answer:

cos(3x + x)

Step-by-step explanation:

This cos 3x cos x - sin 3x sin x matches the cos(A + B) where A is 3x and B is x.

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The solution of the expression will be Cos(3x+x).

What is an expression?

Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication and division.

Given that:-

  • Cos 3x os x - Sin 3x Sin x

The solution will be calculated by using the formula:-

Cos(A+B)   = (CosA CosB  -  SinA SInB)

Cos(3x+x). = Cos 3x os x - Sin 3x Sin x

Therefore the solution of the expression will be Cos(3x+x).

To know more about expression follow

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