问题
解答题
计算: (1)2sin30°+3tan30°+cot45°; (2)sin45°+tan60°cos30°; (3)
|
答案
(1)原式=2×
+3×1 2
+1=2+3 3
;3
(2)原式=
+2 2
×3
=3 2
;
+32 2
(2)原式=
=3
-13 2
=23 1 2
.3
计算: (1)2sin30°+3tan30°+cot45°; (2)sin45°+tan60°cos30°; (3)
|
(1)原式=2×
+3×1 2
+1=2+3 3
;3
(2)原式=
+2 2
×3
=3 2
;
+32 2
(2)原式=
=3
-13 2
=23 1 2
.3