Answer:
Step-by-step explanation:
Using the difference formula for cosine and the exact values
cos45° = sin45° = 
, cos30° = 
, sin30° = 
cos(a - b) = cosacosb + sinasinb
Note 15° = 45° - 30°, thus
cos15°
= cos(45 - 30)°
= cos45°cos30° + sin45°sin30°
= ( × ) + ( × )
= 
+ 
=
Answer:
<h2>(3, -2)</h2>
Step-by-step explanation:
Put the coordinates of the points to the inequality and check:
y < -1/2x + 2
for (2, 3) → x = 2, y = 3
3 < -1/2(2) + 2
3 < -1 + 2
3 < 1 FALSE
============================
for (2, 1) → x = 2, y = 1
1 < -1/2(2) + 2
1 < -1 + 2
1 < 1 FALSE
============================
for (3, -2) → x = 3, y = -2
-2 < -1/2(3) + 2
-2 < -1.5 + 2
-2 < 0.5 TRUE
============================
for (-1, 3) → x = -1, y = 3
3 < -1/2(-1) + 2
3 < 1/2 + 2
3 < 2 1/2 FALSE
The answer is A. I hope I helped
Answer:
5 shirts for 12 is 60 dollars
20 dollar dress plus 60 is 80
Step-by-step explanation:
Answer:
Transitive
Step-by-step explanation:
