Gareth56 Posted September 5, 2008 Share Posted September 5, 2008 I've often seen in equations cos^2 then some angle so for example:- cos^2 45deg. How does this work on a calculator or do you have to do something clever to work this out? Also what does cos^2 mean (other than cos x cos)? Thanks Link to comment Share on other sites More sharing options...
NeonBlack Posted September 5, 2008 Share Posted September 5, 2008 [math]\cos^2x[/math] is an easier way to write [math](\cos{x})^2[/math] edit: the advantage is that you will not confuse it with [math]\cos{(x^2)}[/math] Link to comment Share on other sites More sharing options...
ajb Posted September 5, 2008 Share Posted September 5, 2008 It just means [math](\cos x)^{2}[/math]. You use it to avoid confusion with [math]\cos x^{2}[/math]. Link to comment Share on other sites More sharing options...
Gareth56 Posted September 5, 2008 Author Share Posted September 5, 2008 Many thanks. Link to comment Share on other sites More sharing options...
Air Posted September 5, 2008 Share Posted September 5, 2008 I've often seen in equations cos^2 then some angle so for example:- cos^2 45deg. How does this work on a calculator or do you have to do something clever to work this out? Also what does cos^2 mean (other than cos x cos)? Thanks [math]\cos ^2 x = \left(\cos x\right)^2[/math] Note that [math]\cos \left(45^{\circ}\right) = \frac{1}{\sqrt{2}} \therefore \cos ^2 \left(45^{\circ}\right) = \left(\frac{1}{\sqrt{2}}\right)^2 = ... [/math] Link to comment Share on other sites More sharing options...
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