cos2x=0

x=pi/4 but how?

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- March 31st 2010, 02:41 PMtbenne3solve for x
cos2x=0

x=pi/4 but how? - March 31st 2010, 02:55 PMskeeter
- March 31st 2010, 02:56 PMpickslides
- March 31st 2010, 03:43 PMpitoten
Remember that we are talking about radians and not degrees! Review the unit circle. You will see that wherever the circle crosses the y axis, the cosine of that value is always zero. If you type in [pi]/4 into your calculator and it is set in degrees, you will be very confused.