Answer:
x=7 x=-1
Step-by-step explanation:
Answer:
No
Step-by-step explanation:
Find a common factor:
2(9:10) = 18:20 ≠ 6:20
cos(a - b) - cos(a + b) = 2sin(a)sin(b)
[cos(a)cos(b) + sin(a)sin(b)] - [cos(a)cos(b) - sin(a)sin(b)] = 2sin(a)sin(b)
[cos(a)cos(b) - cos(a)cos(b)] + [sin(a)sin(b) + sin(a)sin(b)] = 2sin(a)sin(b)
2sin(a)sin(b) = 2sin(a)sin(b)
Answer:
Step-by-step explanation:
(x - 8)/2 = -5
x - 8 = -10
x = -2
(y + 6)/2 = 10
y + 6 = 20
y = 14
(-2, 14)