jtkgotosleep123
jtkgotosleep123 jtkgotosleep123
  • 01-12-2020
  • Mathematics
contestada

what is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)sin(pi/7)?

a. -squr3/2
b. -1/2
c. 1/2
d. squr3/2​

Respuesta :

funnymunchies2004
funnymunchies2004 funnymunchies2004
  • 07-12-2020

Answer:

B

Step-by-step explanation:

-1/2

Answer Link
camjjwo camjjwo
  • 12-06-2021

Answer:

B -1/2

Step-by-step explanation:

Answer Link

Otras preguntas

solve for v -2 over 7i need help to solve v and with steps please
Patrick bought his recliner on sale for 3x + 1 dollar. To replace his recliner now, ir would cost 5x - 3 dollars. Write an expression that represents the differ
african kingdoms that provided slave labor to the Americas: A. Abandoned colonies in Europe. B. Invaded European nations. C. Grew in power. D
Kia went to a hypnotherapist for treatment. which of her problems might hypnotherapy be most helpful for?
Is : Están comiendo mucho grammatically correct or incorrect?
"twenty of the 100 digital video recorders​ (dvrs) in an inventory are known to be defective. what is the probability you randomly select an item that is not​ d
Patrick bought his recliner on sale for 3x + 1 dollar. To replace his recliner now, ir would cost 5x - 3 dollars. Write an expression that represents the differ
The slope of the tangent to a curve at any point (x, y) on the curve is -x/y. Find the equation of the curve if the point (3, −4) is on the curve.
What are the three general purpose of most classroom speeches? how do they differ? give examples of topics that would be appropriate for each general purpose?
On average, boys tend to have better abilities than girls in