Mathematics

Question

How do I begin this equation
How do I begin this equation

1 Answer

  • Trigonometry:
    We know that   csc x = 1 / sin x    and π = 180°;
    sin 5π/ 6 = sin 150° = 1/2
    csc 2π / 3 = 1 / sin 120° = 1 / √3/2 = 2 / √3
    Finally:
    4 · 1/2 + 7 · ( 2 / √3 )² = 2 + 7 · 4/3 = 
    = 2 + 28/3 = 2 + 9 1/3 =  11  1/3
NEWS TODAY