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Question trig stuff

xlynsey

Posted 27 November 2006 - 04:56 PM

could anyone show me how to do the following question please

solve: sinx + sin 1/2 x = 0

(sinx add sin half x equals zero)

Thanks in advance to anyone that can help biggrin.gif

John

Posted 27 November 2006 - 10:40 PM

Take the 2 SINs over to the RHS to leave the 2 x terms on the LHS and solve for x.

Post your solution if you think the answer is incorrect.

Untouchable

Posted 28 November 2006 - 12:31 AM

Take the sinx and consider it to be sin(½x + ½x)

You can the rewrite the equation as: sin(½x + ½x) + sin½x = 0

Apply the trig identity for Sin2A to the sin(½x + ½x) and you should be on your way to solving the equation


xlynsey

Posted 28 November 2006 - 04:03 PM

Ahh got it now using untouchables method
Thanks for that smile.gif

Untouchable

Posted 28 November 2006 - 10:31 PM

Glad to Help.


"To explain all nature is too difficult a task for any one man or even for any one age. `Tis much better to do a little with certainty, and leave the rest for others that come after you, than to explain all things."

Isaac Newton (1642-1727)

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