rotate X and Z 30 degrees counterclockwise

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hello 

i want to rotate coordinate system of tool 30 degrees clockwise i know that we must calculate q1 and q2,q3,q4 using matrix method :neutral: 
when i did rotate 90 degrees it work good because i think cosinus(90)=0 and cosinus(0)=1 . but when i use angles like 30 or 45 it doesn't work for me any one can help and explain for me good and practice method :smile:  ? 
 Regads    
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