Question

1)4 cos 90° + 2 cos 180 2) cos 0° – cos 180° + sin 90°помогите  !

Answer 1

Решение:
1) 4*0+2*(-1)=-2
2) 1-(-1)+1=3

Answer 2

1. We know that $\cos 90° = 0$ and $\cos 180° = -1$. Therefore,

$4\cos 90° + 2\cos 180° = 4(0) + 2(-1) = -2$

So the value of the expression is -2.

2. We know that $\cos 0° = 1$, $\cos 180° = -1$, and $\sin 90° = 1$. Therefore,

$\cos 0° - \cos 180° + \sin 90° = 1 - (-1) + 1 = 3$

So the value of the expression is 3.