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RonnyDeKoning

  • 3 years ago

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

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  1. hartnn
    • 3 years ago
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    no difference, both are negatives.

  2. RonnyDeKoning
    • 3 years ago
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    But, I don't understand this:tan (-alpha) = -tan alpha

  3. hartnn
    • 3 years ago
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    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
    • 3 years ago
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    I don't understand.

  5. hartnn
    • 3 years ago
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    what exactly is your doubt ?

  6. RonnyDeKoning
    • 3 years ago
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    so (tan (-x) is from the 4th quadrant and -tan x in the first, how can it be negative in the first.

  7. hartnn
    • 3 years ago
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    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
    • 3 years ago
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    What is a ratio?

  9. hartnn
    • 3 years ago
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    sin,cos , tan,.... are ratios...

  10. RonnyDeKoning
    • 3 years ago
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    I a making an ex: and see this: tan x = -1 <=> - tan x (pi/4) Why is the - before tan?

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