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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Originally Posted by theowne 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? write as . then your equations break down into quadratic equations in . It is easy to find the zeros from there
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