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Author Topic: Math Problems  (Read 1938 times)

Elfeater

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Math Problems
« on: October 17, 2013, 04:44:47 pm »
Meet the lowly trig student, me.
So, I have stumbled across a problem where you have to create trigonometric identities, and proof them. However, on this particular one, I am stumped.

cos(x)+sin(x)-sin^(3)(x)/sin(x)=cot(x)+cos^(2)(x)

Thanks for the help!
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Lectorog

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Re: Math Problems
« Reply #1 on: October 17, 2013, 04:54:25 pm »
Rewriting cot(x) as cos(x)/sin(x) is always one of my first steps.

Is the /sin(x) on the left the denominator for the rest of the left, or just sin^(3)(x)?
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Elfeater

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Re: Math Problems
« Reply #2 on: October 17, 2013, 10:25:02 pm »
It is the denominator. Thanks for your help so far!
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Quote from: Darvi on October 16, 2012, 03:15:40 pm
I for one support our child snatching overlords.
Quote from: Akroma on May 13, 2009, 07:03:13 am
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Vector

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Re: Math Problems
« Reply #3 on: October 17, 2013, 11:12:11 pm »
[cos(x) + sin(x) - sin^(3)(x)]/sin(x)

[sin(x)/tan(x) + sin(x) - sin^(3)(x)]/sin(x)

1/tan(x) + 1 - sin^(2)(x)

cot(x) + sin^(2)(x) + cos^(2)(x) - sin^(2)(x)

cot(x) + cos^(2)(x)

Always start with the side that looks more complicated.
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