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December 21, 2014

December 21, 2014

Posted by **Ntombie** on Monday, September 19, 2011 at 12:02pm.

- trig -
**Steve**, Wednesday, September 21, 2011 at 12:38pmThe graph of cos2x looks just like the graph of cos x, but oscillates twice as fast. So, since cos x crosses at -90 and 90, cos 2x crosses at -135, -45, 45, 135 deg.

The sin graph looks just like sin x, but is shifted to the left 30 deg. (That is, x+30 is zero when x=-30. In effect, just draw a new y-axis at x=-30 deg.)

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