Question

Cos4xcos3x+sin4xcos3x​

Answer 1

Объяснение:

понятно все правильно

Answer 2

To simplify the expression $\cos(4x)\cos(3x) + \sin(4x)\cos(3x)$, you can use trigonometric identities. One of the identities you can use is the product-to-sum identity:

$\cos(A)\cos(B) = \frac{1}{2}[\cos(A+B) + \cos(A-B)]$

Let's apply this identity to your expression:

$\cos(4x)\cos(3x) + \sin(4x)\cos(3x)$

$= \frac{1}{2}[\cos(4x+3x) + \cos(4x-3x)] + \sin(4x)\cos(3x)$

$= \frac{1}{2}[\cos(7x) + \cos(x)] + \sin(4x)\cos(3x)$

Now, your expression is in a form that is simplified using the given trigonometric identities.