Step-by-step explanation:
Given the geometric sequence
8 + 6 + 4.5...
A geometric sequence has a constant ratio and is defined by























∵ 


∵
, 
so
∵ 

∵ 
∵ 
Therefore, the sum of the first 25 terms in this geometric series: 31.98
Answer:
Gimme some time
Step-by-step explanation:
Answer:
n + 14
I don't know if it's correct but i'm trying to help :)
Sec^2 x - 1 = tan^2x
Proof:
Sec^2x = 1+ tan^2x
1/cos^2x = 1 + sin^2x/cos^2x
<span>1/cos^2x - sin^2x/cos^2x = 1
</span>Using common denominator:
(1-sin^2x)/cos^2x = 1
sin^2x + cos^2 x = 1
cos^2 x = 1 - sin^2x
Substituting :
cos^2x/<span>cos^2x = 1
</span>1 = 1
Left hand side = right hand side
5, and -5 because a negative times a negative equals a positive