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aussy123

  • 3 years ago

Can someone explain this problem to me? tan(-20°) = -tan20° True- The answer is true, but I dont know why. False

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  1. harsimran_hs4
    • 3 years ago
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    ok let`s try can you tell sin(-x) = ? (in terms of sin(x))

  2. aussy123
    • 3 years ago
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    umm Im not sure

  3. harsimran_hs4
    • 3 years ago
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    anyways try...tell whatever is in your mind

  4. aussy123
    • 3 years ago
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    sin(180 -) = sin

  5. harsimran_hs4
    • 3 years ago
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    ok so sin(-x) = - sin(x) (clear ?)

  6. aussy123
    • 3 years ago
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    okay

  7. harsimran_hs4
    • 3 years ago
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    now try for cos(-x) = ?

  8. aussy123
    • 3 years ago
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    okay cos(-x)=-cos(x)

  9. harsimran_hs4
    • 3 years ago
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    NO!!

  10. aussy123
    • 3 years ago
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    cos(-x)=cos(x)

  11. harsimran_hs4
    • 3 years ago
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    so now on right track so tan(-x) = sin(-x)/ cos(-x) = -sin(x)/ cos(x) = - tan(x) do you get it now?

  12. aussy123
    • 3 years ago
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    yes, I believe so

  13. harsimran_hs4
    • 3 years ago
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    why are you still not sure what`s the confusion?

  14. aussy123
    • 3 years ago
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    Im saying I believe so, because Im new to this so im not going to know this, but I believe I know enough to get through this lesson

  15. harsimran_hs4
    • 3 years ago
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    ok so does that end this question or there is still something that you need to ask?

  16. aussy123
    • 3 years ago
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    No Im good, Thank you for your time!

  17. harsimran_hs4
    • 3 years ago
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    :)

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