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June 6th, 2011, 02:38 AM   #1
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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?
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June 6th, 2011, 05:08 AM   #2
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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?
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June 6th, 2011, 06:25 PM   #3
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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.
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June 7th, 2011, 01:48 AM   #4
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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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