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SugarRainbow

  • 3 years ago

combine the fractions and simplify to a multiple of a power of a basic trigonometric function sinx/cot^2x-sinx/cos^2x?

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  1. SugarRainbow
    • 3 years ago
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    can i change the sinx/cos^2x into tan^2x?

  2. zepdrix
    • 3 years ago
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    Hmm no. You can take ONE of the cosines, and change it to tanx*(1/cosx) But I dont know if that's the right way to go c: hmm

  3. zepdrix
    • 3 years ago
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    \[\large \frac{ \sin x }{ \cot^2 x }-\frac{ \sin x }{ \cos^2 x }=\frac{ \sin x }{ (\frac{ \cos^2 x }{ \sin^2 x }) }-\frac{ \sin x }{ \cos^2 x }\] \[\large \frac{ \sin x }{ 1 }*\frac{ \sin^2 x }{ \cos^2 x }-\frac{ \sin x }{ \cos^2 x }\]

  4. zepdrix
    • 3 years ago
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    There are multiple ways to simplify it, since there are so many trig identities, so you might find a different way... but this is what I was thinking :3

  5. zepdrix
    • 3 years ago
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    \[\large \frac{ \sin^3 x - \sin x }{ \cos^2 x }\]

  6. zepdrix
    • 3 years ago
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    Confused about any of that so far? :D

  7. SugarRainbow
    • 3 years ago
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    how did you get sinx/1∗sin^2x/cos^2x

  8. zepdrix
    • 3 years ago
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    \[\large \frac{ \left(\frac{ a }{ b }\right) }{ \left(\frac{ c }{ d }\right) }=\frac{ a }{ b }*\frac{ d }{ c }\]

  9. zepdrix
    • 3 years ago
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    Remember how you can do that? when dividing fractions :D flip the bottom one and rewrite it as multiplication.

  10. SugarRainbow
    • 3 years ago
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    but the top wasn't a fraction yet it was sinx/ (cos^2x/sin^2x)

  11. SugarRainbow
    • 3 years ago
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    oh wait you put it over 1 to make it into a fraction huh?

  12. zepdrix
    • 3 years ago
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    \[\huge \frac{ \left(\sin x \right) }{ \left(\frac{ \cos^2 x }{ \sin^2 x } \right) }=\frac{ \left(\frac{ \sin x }{ 1 } \right) }{ \left(\frac{ \cos^2 x }{ \sin^2 x } \right) }\]

  13. zepdrix
    • 3 years ago
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    Yah hehe :3

  14. zepdrix
    • 3 years ago
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    I gotta go, so lemme post the rest of the steps, and you can at least look at them while I'm gone. I won't be here to answer questions though :c

  15. SugarRainbow
    • 3 years ago
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    okay

  16. zepdrix
    • 3 years ago
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    \[\large \frac{ \sin^3 x - \sin x }{ \cos^2 x }=\frac{ \sin x(\sin^2 x - 1) }{ 1-\sin^2 x }\]

  17. zepdrix
    • 3 years ago
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    Factored a sinx from each term in the top. Rewrote cos^2 as 1-sin^2 using identity :D

  18. zepdrix
    • 3 years ago
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    Now if we factor a -1 ouch of each term in the top brackets, we'll have a nice easy cancellation.

  19. zepdrix
    • 3 years ago
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    \[\large \frac{ -\sin x(1-\sin^2 x) }{ 1-\sin^2 x }=-\sin x\]

  20. zepdrix
    • 3 years ago
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    Hopefully I didn't make a mistake in there :D heh

  21. SugarRainbow
    • 3 years ago
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    alright well thanks

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