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September 21, 2014

September 21, 2014

Posted by **Natalie** on Sunday, April 7, 2013 at 1:13pm.

cos (x+pi/6) +sin (x-pi/3) = 0

- Precalculus with Trigonometry -
**Reiny**, Sunday, April 7, 2013 at 1:18pmI will use 30° and 60° , easier to type

cos (x+300) +sin (x-60)

= cosxcos30 - sinxsin30 + sinxcos60 - cosxsin60

= (√3/2)cosx - (1/2)sinx + (1/2)sinx - (√3/2)cosx

= 0

= RS

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