Pure sine wave problem exam

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AHMED SALLAM

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HOMEWORK-style question ( no evidence of attempt on your own )
Help me to solve it
 

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This is a simple trigonometry problem,

you can work out the angle of A by reference to the intersection of the line of A with the crossing of Red & Blue sine waves ( 1/2 of 329 high )

knowing the angle you can then work out the value of the point indicated.
 

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