Recall the Maclaurin expansion for cos(x), valid for all real x :

Then replacing x with √5 x (I'm assuming you mean √5 times x, and not √(5x)) gives

The first 3 terms of the series are

and the general n-th term is as shown in the series.
In case you did mean cos(√(5x)), we would instead end up with

which amounts to replacing the x with √x in the expansion of cos(√5 x) :

I’m pretty sure the answer would be 116
Answer:
Step-by-step explanation:
3x+18>2x
3x-2x>-18
x>-18
Answer:
Explanation:
first term, a₁ = 1
difference between the terms: -3
- used geometric formula :

<u>where "a₁ is first term" and "r refers to common difference"</u>
- formula for this nth term:
