Answer:
We know that:
Sin(a + b) = sin(a)*cos(b) + sin(b)*cos(a)
Then if we use this property in our expression:
sin(a-30)-sin(a+30)
We get:
sin(a)*cos(-30°) + sin(-30°)*cos(a) - sin(a)*cos(30°) - sin(30°)*cos(a)
Now remember that:
sin(-x) = -sin(x)
and
cos(-x) = cos(x)
Then we can rewrite our expression as:
sin(a)*cos(30°) - sin(30°)*cos(a) - sin(a)*cos(30°) - sin(30°)*cos(a)
= -2*sin(30°)*cos(a)
and sin(30°) = 0.5
Then:
-2*sin(30°)*cos(a) = -2*0.5*cos(a) = -cos(a)
So we get:
sin(a-30)-sin(a+30)= - cos(a)
Answer:
278.88 cm
Step-by-step explanation:
Step-by-step explanation:
It should be Vascular tissue
Answer: order
Step-by-step explanation:
The cost of one ounce of soup will be $0.20
<u><em>Explanation</em></u>
A carton of milk containing 12 cans of soup costs $38.40 and each can weighs 16 ounces.
So, the total weight of 12 cans of soup ![=(16*12)ounces=192 ounces](https://tex.z-dn.net/?f=%3D%2816%2A12%29ounces%3D192%20ounces)
That means, the cost of 192 ounces of soup is $38.40
Thus, the cost of one ounce of soup
dollar.