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Im struggling in Trigonometry and i really need help, and yes i have asked my teacher for help and i go to tutorials but its still confusing..

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You can book the sessions in online http://www.tutorvista.com
http://www.tutorvista.com/math/trigonometry?cpid=50707&sa=1

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I said free
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Well if you don't understand it, the internet isn't going to do much to help you. All it is going to do is give you the answer, which may help you in the short run but not the long run. The site is www.myalgebra.com

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Well why don't you go to tutoring, or ask a teacher for help. Using the Internet will not help you. If you just get the answer then you will not know what to do on a test or future assignments.

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Not everything in life is free. If trig is important to you, be willing to pay a bright student to tutor you,

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The top of a flagpole sways back and forth in high winds. The top sways 10 cm to the right and 10 cm to the left of its resting position and moves back and forth 240 times every minute. At t=0 the pole was momentarily at its resting position. Then it started moving to the right.
a. Determine the equation of a sinusoidal function that describes the distance the top of the pole is from resting position in terms of time. (Show your solution of a, b, c, d parameters and period)
b. Find the domain and range?
c. If the winds speed decreasingly slightly such that the sway of the top of the pole is reduced by 20%, what is the new equation of the sinusoidal function? Assume that the period remains the same.