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June 6th, 2011, 02:38 AM  #1 
Newbie Joined: Jun 2011 Posts: 1 Thanks: 0  Help With Assignment Due 2morrow
Hi i was wondering if you could help me with 2 questions needed ASAP ive sat here 4 an hour trying 2 figure em out, Doing Radians ATM 1. Develop an equation the the forrm y= cos(x+c) that looks exactly the same as y= sin(x) 2.At the start of your assignment you chose 3 variables a,b,d. Rewrite the Y= asin(bx+d) using the variables (easy as) variables a=2,b=4,d=3 But how would i start graphing it? 
June 6th, 2011, 05:08 AM  #2 
Member Joined: Jun 2007 From: Richmond, VA Posts: 46 Thanks: 0  Re: Help With Assignment Due 2morrow
1. Look at the graphs of sin(x) and cos(x). What would you do to one to make it overlay the other?

June 6th, 2011, 06:25 PM  #3 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
1. Since cos(?/2 + x) = sin x, i.e. cos(?/2 + x) = cos(x  ?/2) = cos(x + ?/2), hence cos(x + ?/2) = sin x. Therefore c = ?/2.

June 7th, 2011, 01:48 AM  #4 
Senior Member Joined: Sep 2010 Posts: 101 Thanks: 0  Re: Help With Assignment Due 2morrow
2. a  determines amplitude of sine wave b  determines frequency of sine wave c  determines phase shift of sine wave 

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