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b) 3/4 +6/4 +3/4=12/4=3
c) (√3/2 *1)² - (√3/2)²=3/4-3/4=0
d) (√2/2)² + (1/2)² -1=2/4+1/4-1=3/4-4/4=-1/4
e) (√2/2)² +(√3/2)² / (1-√3/3)(1+√3/3)=2/4+3/4/1-3/9=5/4 : 9/9-3/9=5/4 : 6/9= 5/4*9/6=45/24