Ice2zoey1Chard
Ice2zoey1Chard Ice2zoey1Chard
  • 15-06-2016
  • Mathematics
contestada

Evaluate
a) sin (4pi/3)
b) cos (5pi/6)

Respuesta :

padawan
padawan padawan
  • 15-06-2016
sin(pi + a) = -sin(a)
sin(4pi/3) = sin(pi + pi/3) = -sin(pi/3)

cos(pi-a) = -cos(a)
cos(5pi/6) = cos(pi -pi/6) = -cos(pi/6)
Answer Link
HomertheGenius
HomertheGenius HomertheGenius
  • 21-06-2016
a) sin ( 4π/3 ) = sin 240° = sin ( 180° + 60°) = - sin 60° = [tex]- \frac{ \sqrt{3} }{2} [/tex]

b) cos (5π/6 ) = cos 150° = cos ( 90° + 60° ) = - sin 60°=[tex]- \frac{ \sqrt{3} }{2} [/tex]
 
Answer Link

Otras preguntas

PLEASE HELP What is a common saying that has the word smoke and go in between smoke??
France traditions and explain
Make L the subject of the formula in T= 2H √L/G[tex] \sqrt{ \frac{l}{g?} } [/tex]​
30. Referring to the figure, three students performed in a school concert. The school paper asked nine judges to give each student a score from one to three. T
When Susan B. Anthony registered to vote, some said she broke the law. Which statements name results of Anthony’s trial? Choose all answers that are correct.
For P ={10, 12, 13, 15), Q = {2, 6, 11), and R=(3, 6, 8, 11), find P U (Q n R).
Write – 90 7 50 as a decimal number.
Algebra 2 1.6: self-assessment (4-8) question 6 Write a piecewise function represented by the graph.
Workers in an office of 90 staff were asked their favourite type of take-away. The results are summarised in the table. Take-away Frequency Angle Pizza 29 a C
Depois de ouvir The Tell-Tale Heart, de Edgar Allan Poe Pergunta: O que o narrador ouviu no final da história?