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b)4 sin60- 3 tg45 + 5 tg60=4·√3/2-3·1+5·√3=2√3-3+5√3=7√3-3
c)2 sin²30+ 3 cos²60- tg²60 =2·(1/2)²+3·(1/2)²-(√3)²=2·1/4+3·1/4-3=2/4+3/4-3=5/4-3
=1 i 1/4-3=-1 3/4