# pre-calculus

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Posted by Steve on October 31, 2002 at 22:48:08:

Hi,
I am in real desperate need for someone to answer these problems. I must hand this assignment in on Monday 4th November 2002. Please, can anyone help me? I am not trying to take the easy way out here. I have run out of time for this course. I am looking into more courses (at an easier level) so I can come to terms with fundamentals some more. Well, here they are...

1. Sketch graph of y = 15sin2x for 0
2. Draw the graph of y = 6cos(40+2) for 0<0<2(pi symbol)

3. For the graph of y = 120cos(60-45deg)
What is
a) the amplitude
b) the period
c) the phase shift

4. Given that 55deg = .819 and cos20deg = .94
Show how you would use the identities for sin(A+-B) and cos(A+-B) to find the following;
a) sin 75deg
b) cos 35deg
c) tan 35deg

5. Prove that

a) cosx - cosx
---- ---- =2tanx
1-sinx 1+sinx

b) sinx + cosx 1
---------- ------- = ------
sinx + cosx sinx - cosx 2sin^2-1

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