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acbarnes3

Verify tan(x + pi/2) = -cotx

  • one year ago
  • one year ago

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  1. shreya.
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    tan ( x+ pi/2) = tan ( 90 + x) since the angle is in the second quadrant .where tan is negative. thus the negative sign. and the angle from the horizontal is 180-(90+x) =90-x..hence it changes to cot therefore tan(90=x) = - cotx

    • one year ago
  2. acbarnes3
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    thanks

    • one year ago
  3. shubhamsrg
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    To cut out on the theory, mathematically you can prove it like this : tan(pi/2 +x) = tan(pi/2 - (-x)) = cot(-x) = -cotx

    • one year ago
  4. ZakaullahUET
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    i think u need some other method, the very basic method ? |dw:1359120108418:dw|

    • one year ago
  5. ZakaullahUET
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    just put b=Pi/2 u will get -1/tanc =-cotx

    • one year ago
  6. timo86m
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    tan(x + pi/2) = -cotx it another way of saying cot x flipped along x axis and shifted pi/2 to right or left. I think.

    • one year ago
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