Answer:
106
Step-by-step explanation:
divided 320 by 3
Area = length · width
Area = 3ft · 2ft
Area = 6ft²
hope this helps!
Cos² 2x = (1+cos 4x )/2
cos² 6x = (1+cos 12x)/2
subtract to get 1/2 (cos 4x - cos 12x )
= 1/2 (2 sin 4x sin 8x ) as cos A - cos B = 2 [ sin (A+B)/2 sin (A-B)/2 ]
so the answer
x^2 - 3x + 9 - 5x + 10 = 0
x^2 - 8x + 19 = 0
<span>1/2-(5/4) = x+1/4 // - x+1/4
1/2-x-(5/4)-(1/4) = 0
1/2-x-5/4-1/4 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
</span>
