Homework on sinusoidal functions and radians

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twoswordali

Joined Aug 13, 2008
4
Hello every one if any can help me it would be much appreciated. In the pictures one is the question which is labled number 2. and The other picture is what i have done so far for working out however im still confused and not sure if im following this correctly. Not only do i need an answer i would also love an explanation so that i can understand this more. This is a question from my HNC Engineering maths thank you very much
 

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