Answer:
C) 
Step-by-step explanation:

We will use double angle identities:
cos (5x ) = sin (10x )
cos (5x ) = 2 cos (5x ) sin ( 5x )
cos ( 5 x) - 2 cos ( 5 x ) sin ( 5x ) = 0
cos ( 5 x ) · [ 1 - 2 sin (5 x) ] = 0
cos ( 5 x ) = 0 or : 1 - 2 sin (5 x) = 0
5 x = π/2 +kπ, k∈Z sin (5 x) = 1/2
x1 = π/10 + kπ/5 5 x = π/6+2kπ , k∈ Z
5 x = 5π/6 +2kπ , k∈ Z
x 2 = π/30 +2kπ/5
x 3 = π/9 + 2kπ/5
Add 37 + 9 = 46
If thats not your answer theres more.
46 divided by 5 = 9.2
I hope this helps you
x^2-4x-12
x -6
x +4
(x-6)(x+4)
Answer:
We conclude that 'None of the above' is the correct answer.
Step-by-step explanation:
Given the expression

Breaking the expression into groups

Factor out
from

Factor out -2 from 

so the expression becomes


Factor out the common term 

Therefore, from the given options, we conclude that 'None of the above' is the correct answer.