Answer:
$598
Step-by-step explanation:
2 x 299 = 598 so Apple is charging $598 for the new phone.
Let a, b and c
The lengths of triangle
The sum of two sides will always be larger than the other side.
Then,
| b - c | < a < b + c
| a - c | < b < a + c
| a - b | < c < a + b
To the question A)
a = 83
83 < 40 + 34
83 < 74
False!
____________
Letter B)
a = 51
51 < 33 + 5
False!
___________
Letter C)
a = 50
50 < 31 + 19
False!
____________
Now on the letter D)
a = 29
29 < 18 + 13
29 < 31
It is correct!
Then,
The letter D) would be the answer!
The answer is difference hope this helps
Use the double angle identity:
sin(2<em>x</em>) = 2 sin(<em>x</em>) cos(<em>x</em>)
Now rewrite
sin(2<em>x</em>) sin(<em>x</em>) + cos(<em>x</em>) = 0
as
2 sin²(<em>x</em>) cos(<em>x</em>) + cos(<em>x</em>) = 0
Factor out cos(<em>x</em>) :
cos(<em>x</em>) (2 sin²(<em>x</em>) + 1) = 0
Consider the two cases,
cos(<em>x</em>) = 0 OR 2 sin²(<em>x</em>) + 1 = 0
Solve for cos(<em>x</em>) and sin²(<em>x</em>) :
cos(<em>x</em>) = 0 OR sin²(<em>x</em>) = -1/2
Squaring a real number always gives a non-negative number, so the second case doesn't offer any real solutions. We're left with
cos(<em>x</em>) = 0
Cosine is zero for odd multiples of <em>π</em>/2, so we have
<em>x</em> = (2<em>n</em> + 1) <em>π</em>/2
where <em>n</em> is any integer.
Answer:
8
Step-by-step explanation: