chocobo Posted October 6, 2010 Report Share Posted October 6, 2010 given that tanx=a/b, pi is greater or than x < 3pi/2evaluatecos4xthis is a trig identityi thought it would be 1-2sin22xbut not sure what to do nextplease help Reply Link to post Share on other sites More sharing options...
Austin Glau Posted October 6, 2010 Report Share Posted October 6, 2010 does it define a or b as variables or constants or what? and what unit is this? i can't really recognize it... Reply Link to post Share on other sites More sharing options...
chocobo Posted October 6, 2010 Author Report Share Posted October 6, 2010 the values are a and bsorry if that doesnt help :\ Reply Link to post Share on other sites More sharing options...
Austin Glau Posted October 6, 2010 Report Share Posted October 6, 2010 yeah doesn't really help, is a and b amplitude and phase shift or something? also is that the entire question? it looks like you used the Pythagorean identity with a double angle formula or something, not exactly sure if that is right, i might need to brush up on sl trig Reply Link to post Share on other sites More sharing options...
Abu Posted October 6, 2010 Report Share Posted October 6, 2010 It would really help if you rewrote the question using proper notation, used Latex or included a scan of the book where the question is. Reply Link to post Share on other sites More sharing options...
FoodSta_PasTA Posted November 2, 2010 Report Share Posted November 2, 2010 (edited) Use the double arc angle formula, and you should be good Edited November 2, 2010 by Mahuta ♥ Please do not use text speak- Maha :) Reply Link to post Share on other sites More sharing options...
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