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Fanduekisses

  • 2 years ago

**PRE-CALC HELP PLEASE How to verify the identity tan(x+pi/2)=-cotx ?

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  1. Fanduekisses
    • 2 years ago
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    Do I USE the cofunction identity?

  2. tkhunny
    • 2 years ago
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    You use whatever works. Let's see what happens when you use the cofunction identity.

  3. Muhammad_Nauman_Umair
    • 2 years ago
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    tan(x+y) = (tan x +tan y) / (1- tan x tan y)

  4. Muhammad_Nauman_Umair
    • 2 years ago
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    here y is pi/2

  5. Fanduekisses
    • 2 years ago
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    ooooh I see so x is x and y is pi/2?

  6. Muhammad_Nauman_Umair
    • 2 years ago
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    yes

  7. Fanduekisses
    • 2 years ago
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    so x + pi/2/ 1-x + pi/2 ?

  8. Fanduekisses
    • 2 years ago
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    is that correct?

  9. Muhammad_Nauman_Umair
    • 2 years ago
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    no

  10. Muhammad_Nauman_Umair
    • 2 years ago
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    tan x + tan 90/ (1- tan90 *tanx)

  11. Muhammad_Nauman_Umair
    • 2 years ago
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    then divide numerator and denominator by tan 90 . as u know tan 90 is "infinite" and 1 / "infinte" = 0 Now try to solve it

  12. Muhammad_Nauman_Umair
    • 2 years ago
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    no

  13. Muhammad_Nauman_Umair
    • 2 years ago
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    (tan x/tan 90+1 ) / [(1 /tan 90) - tanx)]

  14. Muhammad_Nauman_Umair
    • 2 years ago
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    got it ?

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