amandalundgreen amandalundgreen

21-12-2016
Mathematics

contestada

Verify the identity. Show your work.
cos(α - β) - cos(α + β) = 2 sin α sin β

Respuesta :

Peytiii2829 Peytiii2829

23-12-2016

cos (a-b) = cos(a)cos(b) + sin(a)sin(b)
cos (a+b) = cos(a)cos(b) - sin(a)sin(b)
so, cos(a-b) - cos(a+b) =

=cos(a)cos(b) + sin(a)sin(b) - [cos(a)cos(b) - sin(a)sin(b)]
=2sin(a)sin(b)

Answer Link

Otras preguntas

what is the product of (x+1) and (2x^2+3x-1)

what is the value of f(16)-f(0) when f(x)=4x-8?

how do earth worms breath?

first the _ is copied, and then the cell splits

Which of the points of natural selection is also referred to as "survival of the fittest"? More offspring are born than can be supported by the environment. If

how to find the volume of a cylinder in terms of pi

PLEASE HELP A man named Alexander Graham Bell received a patent for his telephone invention in 1876. Today, many Americans carry a cell phone around with them.

Draw two different figures that each have a perimeter of 14 units .Then find the aera of each

The growth of American cities during the late 19th and early 20th centuries led progressive reformers to push for which of these? improved public services restr

During the Meiji period, Japan began building an empire, as Europe had done. Wars with China and Russia at the turn of the 20th century led to Japanese control