问题
解答题
计算: (1)
(2)sin30°+cos245°-tan60°cot60°. |
答案
(1)原式=2
-1+4-35
=2
;5
(2)原式=
+(1 2
)2-2 2
×3 3 3
=
+1 2
-11 2
=0.
计算: (1)
(2)sin30°+cos245°-tan60°cot60°. |
(1)原式=2
-1+4-35
=2
;5
(2)原式=
+(1 2
)2-2 2
×3 3 3
=
+1 2
-11 2
=0.