((( \frac{ 15-(x \times \cos ( 30 ) ) }{ \cos ( 15 ) } ) \times \cos ( 15 ) +(x \times \cos ( 30 ) )-15
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15-x\cos(30)+x\cos(30)-15
Cancel out \cos(15) and \cos(15).
15-15
Combine -x\cos(30) and x\cos(30) to get 0.
0
Subtract 15 from 15 to get 0.
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