计算:(1) 2sin30°+2cos60°+4tan45°;(2) sin30°+co s 2 45°- 1
1个回答
(1)原式=2×
1
2 +2×
1
2 +4×1=6.
(2)原式=
1
2 + (
2
2 ) 2 -
1
3 × (
3 ) 2 =0.
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