B is the answer to that question !!!
Hi there!
We are given:
cos(7x)cos(4x) = -1 - sin(7x)sin(4x)
Begin by moving all terms with variables to one side:
cos(7x)cos(4x) + sin(7x)sin(4x) = -1
The corresponding trig identity is cos(A - B). Thus:
cos(7x - 4x) = cos(7x)cos(4x) + sin(7x)sin(4x) = -1
cos(3x) = -1
cos = -1 at π, so:
3x = π
x = π/3
We can also find another solution. Let 3π = -1:
3x = 3π
x = π
Thus, solutions on [0, 2π) are π/3 and π.
hello there's an app calle
Happy New Year from MrBillDoesMath!
Answer:
i ^ (2n) = (i^2)^n = (-1)^n = -1 if n is odd and = 1 if n is even
i ^ (2n+1) = i^(2n)* i = -1 * i = -i if n is odd and = 1*i = i if n is even
Not sure if this answers your question but hopefully pushes you n the right direction.
Thank you,
MrB
Answer:
The total number of pages in all the newspaper is 390,625 pages
Step-by-step explanation:
The number of pages in the newspaper = 25 pages
The number of schools ordering the newspaper = 25 schools
The number of class rooms in each school = 25 classrooms
The number of students in each classroom = 25 students
Therefore;
The total number of pages in all the newspaper = 25 pages per paper × 25 schools × 25 classroom per school × 25 students per classroom
The total number of pages in all the newspaper = 25 × 25 × 25 × 25 = 25⁴
The total number of pages in all the newspaper = 25⁴ = 390,625 pages
