Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

RonnyDeKoning

  • 2 years ago

tan (- alpha) and - tan alpha, what is the different between those 2 "-"'s

  • This Question is Closed
  1. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no difference, both are negatives.

  2. RonnyDeKoning
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    But, I don't understand this:tan (-alpha) = -tan alpha

  3. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    if alpha is in 1st quadrant - alpha is in 4th quadrant. In 4th quadrant, tan ratio is negative. hence, tan(-x)=-tan x

  4. RonnyDeKoning
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I don't understand.

  5. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what exactly is your doubt ?

  6. RonnyDeKoning
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so (tan (-x) is from the 4th quadrant and -tan x in the first, how can it be negative in the first.

  7. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    a ratio can't be in any quadrant.... x is an angle, its in 1st quadrant., then tan x is positive. if x is in 1st quadrant, -x is in 4th quadrant, where tan x is negative, so, we need to bring out -*minus* sign and write tan(-x) = - tan x (....and NOT tan(-x)=tan x)

  8. RonnyDeKoning
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    What is a ratio?

  9. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sin,cos , tan,.... are ratios...

  10. RonnyDeKoning
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I a making an ex: and see this: tan x = -1 <=> - tan x (pi/4) Why is the - before tan?

  11. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.