(1)sin45°-cos60°+tan60°=
今天作业,各位啊~3Q大家啊!!!!还有:(2)cos²30°+sin²30°-tan45°=(3)sin30°-tan30°+cos45°=(4)c...
今天作业,各位啊~3Q大家啊!!!!
还有:(2)cos²30°+sin²30°-tan45°=
(3)sin30°-tan30°+cos45°=
(4)cos30°-sin45°/sin60°-cos45°
(5)sin²30°+2sin60°+tan45°-tan60°+cos²30° 展开
还有:(2)cos²30°+sin²30°-tan45°=
(3)sin30°-tan30°+cos45°=
(4)cos30°-sin45°/sin60°-cos45°
(5)sin²30°+2sin60°+tan45°-tan60°+cos²30° 展开
展开全部
(1)sin45°-cos60°+tan60°=√2/2-1/2+√3
(2)cos²30°+sin²30°-tan45°=3/4+1/4-1=0
(3)sin30°-tan30°+cos45°=1/2-√3/3+√2/2
(4)cos30°-sin45°/sin60°-cos45°=√3/2-(√2/2)/(√3/2)-√2/2=√3/2-√6/3-√2/2
(5)sin²30°+2sin60°+tan45°-tan60°+cos²30°
=1/4+√3+1-√3+3/4
=1+1
=2
(2)cos²30°+sin²30°-tan45°=3/4+1/4-1=0
(3)sin30°-tan30°+cos45°=1/2-√3/3+√2/2
(4)cos30°-sin45°/sin60°-cos45°=√3/2-(√2/2)/(√3/2)-√2/2=√3/2-√6/3-√2/2
(5)sin²30°+2sin60°+tan45°-tan60°+cos²30°
=1/4+√3+1-√3+3/4
=1+1
=2
追问
(1)(2)(3)(4)继续算成一个式子,怎么写??
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