mayalal557 mayalal557
  • 24-04-2021
  • Mathematics
contestada

(Prove that):
2 sin 7A. cos 2A = sin 9A + sin 5A​

Respuesta :

cwrw238 cwrw238
  • 24-04-2021

Answer:

Below.

Step-by-step explanation:

We use the identity:

sin A + sin B = 2 sin(A+B)/ 2 cos(A-B)/2

so sin 9A + cos 5A

= 2 sin (9A + 5A)/2 cos (9A - 5A)/2

=  2 sin 14/2 cos 4/2

= 2 sin7A cos 2A.

Answer Link

Otras preguntas

Jack spends 1 and a quarter as long on his homework as Jill. Last week Jill spent 9 and three quarters of a hour on his homework. How long did Jack take??? Writ
Write a decimal that is equivalent to three and ten hundredths.
what is the best way to determine the phenotype of a birds feathers ?
If a pizza delivery was scheduled to be deliver around 7:45pm and it is now 8:25pm. How many minutes late is the pizza?
You've been assigned a research paper on the Holy Wars. Which of the following would provide a factual basis for additional research? A. Encyclopedia B. Reader
I need help with number 1
how much (in newtons) does a 10.0Kg bag of grass seed weigh
Zariah is training for a 5 kilometer run which is about 3 miles. she begins her training for 5 days. she records the number of minutes it takes her to run a mil
In "Perseverance," which theme is reflected in the lines, "Life's field will yield as we make it / A harvest of thorns or of flowers"? A. Working together he
solve for x and graph: show your work! -9x -30 < 15?