Answer:
c
Step-by-step explanation:
Given that:

since cos (kπ) = 
Then, the series can be expressed as:

In the sum of an alternating series, the best bound on the remainder for the approximation is related to its
term.
∴




Answer:
x= 48
Step-by-step explanation:
Multiply 8 by 6 to get x by itself and you get your answer.
Answer:
This ans is easily solved by using algebraic identities a²- b² = (a+b) (a-b)
Step-by-step explanation:
1. convert into Identity
2. solve quadratic equation that formed.
Answer:
1
Step-by-step explanation:
When n -->∞,
90/∞ ---> 0°.
cos(0° )= 1
1^(2n)=1, 1 in any power is 1.

Answer:
6
Step-by-step explanation:
30-21=9
9/3=3
3x2=6