When you have functions like these:

y=sinx+cos2x

or

y=-sinx-4cos2x

How can I determine the zeroes? Is there an identity for cos2x that could be useful in factoring a term out, or etc?

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- April 17th 2008, 05:26 PMtheowneFinding zeroes for trig functions
When you have functions like these:

y=sinx+cos2x

or

y=-sinx-4cos2x

How can I determine the zeroes? Is there an identity for cos2x that could be useful in factoring a term out, or etc? - April 17th 2008, 05:35 PMJhevon