anonymous
  • anonymous
Derive the trigonometric addition formula for sine: sin(a + b) = sin a cos b + cos a sin b
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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Rogue
  • Rogue
Instead of expanding the thing out, you can also just apply the chain rule.\[\frac {d}{dx} \left[ \sin(a + b) \right] = \cos(a + b)\times \left[ \frac {da}{dx} + \frac {db}{dx} \right]\]
anonymous
  • anonymous
i think the question asks to come up with this identity... nothing to do with derivatives..
Rogue
  • Rogue
oh, lol. I misread :(

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Rogue
  • Rogue
Try this: http://www-spof.gsfc.nasa.gov/stargaze/Strig5.htm
anonymous
  • anonymous
wow, nasa...
Rogue
  • Rogue
NASA scientists do lots of stuff when they're bored... http://apod.nasa.gov/htmltest/gifcity/e.1mil But the information databases they create are very useful =)

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