Answer:
y = -2x+7
Step-by-step explanation:
2x+y=7
Subtract 2x from each side
2x+y -2x=-2x+7
y = -2x+7
A ) cos² x · 1 / sin x - 1 / sin x = - sin x
cos² x - 1 / sin x = - sin x
- sin² x / sin x = - sin x
- sin x = - sin x ( correct )
B ) sin x ( cos x / sin x + sin x / cos x ) = 1 / cos x
sin x · ( cos² x + sin²x ) / sin x cos x = 1 / cos x
sin x · 1 / sin x cos x = 1 / cos x
1 / cos x = 1 / cos x ( correct )
C ) cos² x - sin² x = 1 - 2 sin² x
1 - sin² x - sin² x = 1 - 2 sin² x
1 - 2 sin² x = 1 - 2 sin² x ( correct )
D ) 1/sin²x + 1/ cos²x = 1
cos²x + sin² x / sin² x cos² x = 1
1 / cos² x sin² x = 1
cos²x sin² x ≠ 1
Answer: D ) is not an identity.
Slot method or permutations
14*13*12*11=24024
there are 24024 ways that have different winners
A single line?? well i believe if you draw the 3 angle bisectors for the 3 angles of the triangle you can then inscribe your circle. But I am not sure if you mean only a single line and thats it.
Answer:
try c
Step-by-step explanation:
