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anonymous

  • 5 years ago

My answer does not match the calculator on finding the answer of sin(x/2) when tanx=1/2.

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  1. Hero
    • 5 years ago
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    Here's an idea. Post the complete original question. Then post what you believe is the correct answer.

  2. anonymous
    • 5 years ago
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    I'll try to be as consice as possible: The formula for the half angle of sin is: \[\sqrt{\dfrac{1-\cos x}{2}}\]

  3. anonymous
    • 5 years ago
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    I understand the normal procedure of finding the answer but it doesn't make that much sense, in fact, the answer I get from the formula is the answer the calculator gives me for cos(x/2).

  4. anonymous
    • 5 years ago
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    If tanx=1/2 and pi<x<3pi/2, then cosx=-(2sqrt5)/5 and sinx=-(sqrt5)/5.

  5. anonymous
    • 5 years ago
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    Now, by substituting, I would get something like sqrt((1-(-2sqrt5/5))/2) or sqrt((5+2sqrt5)/10)

  6. anonymous
    • 5 years ago
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    Pumas campeón!

  7. anonymous
    • 5 years ago
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    ¡Campeón de campeones!

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spraguer (Moderator)
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