sme1rcar6terStar
sme1rcar6terStar sme1rcar6terStar
  • 14-10-2016
  • Mathematics
contestada

Use a sum or difference identity to find exact value of sin 255.

Respuesta :

veronicamorgan2 veronicamorgan2
  • 16-10-2016
sin (x + y) = sin x cos y + cos x sin y 

sin 255 
= sin (210 + 45) 
= sin 210 cos 45 + cos 210 sin 45 
= (-1/2)(√(2)/2) + (-√(3)/2)(√(2)/2) 
= -√(2)/4 + (-√(6)/4) 
= -√(2)/4 - √(6)/4 
= (-√(2) - √(6)) / 4
Answer Link

Otras preguntas

Which of the following events reveals that Sir Gawain and the Green Knight is a medieval romance? A.Sir Gawain uses his cunning to trick the Green Knight. /B. S
A scientist wishes to learn about volcanoes and earthquakes. Which of the following spheres should she most directly study
What is the axis of symmetry for the function? y = x2 + 3x - 4 y = -2 x = -2 x = -1.5 y = -1.5 What is the vertex for the function? y = x2 - 4x - 3 (-1, 2) (0,
Which element donates hydrogen ions when dissolved in water? Select one of the options below as your answer: A. acids B. bases C. salts
¿Cuánto cuesta el traje negro?
Find the 30th term of the following sequence. 1, 7, 13, 19, ... 174 175 180 181.
f(x)=x2-3x-7 find f(-3) a- -7 b- 8 c- 11 d- 22
Describe two paths carbon dioxide can take through the carbon cycle?
Which one of the following items would you be most likely to keep in a database? A. Payroll records B. Address book C. Financial statements D. Sales reports
American leaders explained their decision to enter World War I by saying they wanted to1  the recruitment of American men to fight in the war in Europe2  the mo