In this problem, you will derive the formula cos(+) = cos cos sin sin directly. (a) Find
Chapter 9, Problem 9.2.27(choose chapter or problem)
In this problem, you will derive the formula cos(+) = cos cos sin sin directly. (a) Find the coordinates of points P1, P2, P3, and P4 in the unit circle in Figure 9.8. (b) Draw the line segments P1P2 and P3P4 and explain why P1P2 = P3P4, using facts from geometry. (c) Use the distance formula to calculate the lengths P1P2 and P3P4. (d) Write an equation and simplify to obtain the sum formula for cosine.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer