Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
yessir
yessir asked in Science & MathematicsMathematics · 12 months ago

Circular Funtions questions, Will award best answer!?

evaluate each expression. (exact values only)

1. sin(18pi) = ?

2. csc(13pi/4) = ?3. sec(7pi/2) = ?4. sec(5pi/3) = ?5. cot(-11pi/2) = ?

Update:

don't mind the 1.  2.  3.  4.  5.  before each question, tried spacing it out more but ended up like that.

1 Answer

Relevance
  • Jake
    12 months ago
    Favorite Answer

    1. sin(x) when x is a multiple of 2pi is always 0. therefore sin(18pi) = 0

    2. csc(13pi/4) = csc( 3pi+pi/4) = -csc(pi/4) = -sqrt(2)

    3. sec(7pi/2) = sec(3*pi/2+pi/2) = -sec(pi/2) = -1

    4. sec(5pi/3) = sec(pi+2pi/3) = -sec(2pi/3) = -2sqrt(3)/3

    5. cot(-11pi/2) = cot(-5pi+pi/2) = -cot(pi/2) = non defined 

Still have questions? Get your answers by asking now.