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burhan101

  • 3 years ago

trig identity

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  1. burhan101
    • 3 years ago
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    \[\huge \frac{ sinx-2sinx^3 }{ 2\cos^3x-cosx } = tanx \]

  2. Skaematik
    • 3 years ago
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    is this proving? or simplifying?

  3. burhan101
    • 3 years ago
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    proving

  4. burhan101
    • 3 years ago
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    the left side is confusing me to the max

  5. Skaematik
    • 3 years ago
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    |dw:1353299892857:dw|

  6. Skaematik
    • 3 years ago
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    The first step I factored out sinx and cosx The second step I used the double angle formula for cos2x

  7. burhan101
    • 3 years ago
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    o.O you made it look so easy, how are you so good at these ?

  8. Skaematik
    • 3 years ago
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    Its all practice, I suggest you don't ask other people and actually spend at least 5 or 10 minutes trying to figure it out. You get better as you do more

  9. burhan101
    • 3 years ago
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    i do try them all out before asking but i ALWAYS get stuck :S

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