 My Math Forum trigonometic sine wave equation, Help guys please !

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 May 23rd, 2009, 03:12 PM #1 Newbie   Joined: May 2009 Posts: 1 Thanks: 0 trigonometic sine wave equation, Help guys please ! Hi guys, I got a math assignment due on Tuesday and am really stuck with no on to help me around. v1 = 20sin(theta -30) v2 = 30sin(theta +45) vr = v1 + v2 question 1) 1)plot v1,v2 and vr in the same graph 2)resultant equation should be written in the form of vr=Asin (theta + betha) 3) express 20sin ( theta-30) + 30sin (theta +45) in the form of Rsin (theta + alpha) this is the question , i can graph v1 and v2, but for vr , should i just put in values and add them ? and for 2 and 3 i don't how can i do the conversion ? any help is appreciated , thanks . May 23rd, 2009, 04:20 PM #2 Global Moderator   Joined: May 2007 Posts: 6,855 Thanks: 744 Re: trigonometic sine wave equation, Help guys please ! Short tutorial: I'll use capitals for known and x for unknown. You have terms of the form Asin(x+B) sine law gives you AcosBsinx+AsinBcox, where sinB and cosB are known. Add terms to get vr and you will have Msinx+Ncosx, where M and N are known. Now let L=(M^2+N^2)^1/2. So (M/L)^2 + (N/L)^2 = 1. Therefore M/L and N/L are cos and sin of a known angle C. vr=Lsin(x+C). Tags equation, guys, sine, trigonometic, wave Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post HypoXic5665 Applied Math 1 April 3rd, 2013 12:39 AM bjmrtn Trigonometry 4 February 24th, 2012 08:47 AM smash Trigonometry 9 January 4th, 2011 06:29 PM Driehoek Trigonometry 1 September 19th, 2010 10:47 AM blazingclaymore Computer Science 0 February 5th, 2008 02:01 PM

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