The answer is A buddy >:D
8n+3=5
8n=2
N=.25
The number is .25 or 1/4
We know, cos A + cos B = 2cos(C+D)/2 × cos(C - D)/2
So,
cos 130 + cos 110 + cos 10
cos 130 + 2cos (110+10)/2 × cos( 110-10)/2
cos 130 + 2cos 60 × cos 50
cos ( 180 - 50 ) + 2cos60 cos 50
We know, cos ( 180 - A ) = -cos A
2cos 60 cos 50 - cos 50
Also, cos 60 = 0.5
2×0.5 cos 50 - cos50
cos 50 - cos 50
0 = RHS.
Hence proved
Answer:
ABD
Step-by-step explanation:
5 1/2 * 2 1/3 =
11/2 * 7/3 =
77/6 =
12 5/6 <===
