Question

Cos 6 Φ cos 4 Φ-sin 6Φ sin 4Φ

Answer 1

*Ответ*:Я нечего не понел Давай Фоту я магу помоч

Answer 2

To simplify the expression $\cos(6\phi) \cos(4\phi) - \sin(6\phi) \sin(4\phi)$, you can use the trigonometric identity for the cosine of the difference of two angles:

$\cos(A - B) = \cos(A) \cos(B) + \sin(A) \sin(B)$

In this case, you can let $A = 6\phi$ and $B = 4\phi$:

$\cos(6\phi - 4\phi) = \cos(2\phi)$

So, the expression simplifies to:

$\cos(2\phi)$