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anonymous

  • one year ago

FAN + MEDAL Tangent is positive in quadrants I and IV only. true or false?

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  1. anonymous
    • one year ago
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    @Nnesha

  2. Nnesha
    • one year ago
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    |dw:1438291176227:dw|

  3. Nnesha
    • one year ago
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    remember the \(\huge\color{ReD}{\rm CAST}\) rule

  4. anonymous
    • one year ago
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    ?

  5. anonymous
    • one year ago
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    ohhhhhhhhh

  6. anonymous
    • one year ago
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    so false right?

  7. jdoe0001
    • one year ago
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    and SOH CAH TOA \(\bf sin(\theta)=\cfrac{opposite}{hypotenuse} \qquad \qquad % cosine cos(\theta)=\cfrac{adjacent}{hypotenuse} \\ \quad \\ % tangent tan(\theta)=\cfrac{opposite}{adjacent}\)

  8. anonymous
    • one year ago
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    ok

  9. Nnesha
    • one year ago
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    yep

  10. anonymous
    • one year ago
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    ok thank you

  11. anonymous
    • one year ago
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    what about this one If cos Θ = negative two over five and tan Θ > 0, what is the value of sin Θ?

  12. Nnesha
    • one year ago
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    |dw:1438291452445:dw| remember tan = sin over cos so if sin and cos are negative tan would be positive negative divide by negative = positive

  13. Nnesha
    • one year ago
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    for that one you need to draw a right triangle

  14. Nnesha
    • one year ago
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    now they gave you the hints: cos is negative and tan is greater than 0 so at which quadrant you should draw a right triangle ?

  15. anonymous
    • one year ago
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    1 and 2?

  16. Nnesha
    • one year ago
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    no

  17. Nnesha
    • one year ago
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    look at the drawing in which quadrant cos is negative ?

  18. anonymous
    • one year ago
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    2,3,4

  19. Nnesha
    • one year ago
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    no that's not correct cos is negative in 2 quadrants

  20. Nnesha
    • one year ago
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    |dw:1438291982322:dw|

  21. anonymous
    • one year ago
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    ohhhhh

  22. Nnesha
    • one year ago
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    so cos is negative in 2nd and 3rd quadrant

  23. anonymous
    • one year ago
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    yup

  24. anonymous
    • one year ago
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    the answer is negative square root 21 over 5!!!

  25. Nnesha
    • one year ago
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    now given is tan>0 so as you can tan is negative in 2nd quadrant but positive in 3rd so you should draw a right triangle in 3rd quadrant|dw:1438292353952:dw| if you look at jdoe's comment *soh cah tah * rule cos = adjacent over hypotenuse now apply Pythagorean theorem to find 3rd side of right triangle

  26. anonymous
    • one year ago
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    ok

  27. Nnesha
    • one year ago
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    |dw:1438292606283:dw| sorry hypotenuse is 5 not the opposite side

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