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Value of X? PLEASE HELP ME!!

Value of X? PLEASE HELP ME!!-example-1

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Use the trigonomeric function:

\cos30^o=(x)/(10)\\\\/\cos30^o=(\sqrt3)/(2)/\\\\(x)/(10)=(\sqrt3)/(2)\ \ \ |\cdot10\\\\x=\sqrt3\cdot5\\\\x=5\sqrt3

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