计算:(1)sin30°+cos45°+tan60°-cot30°;(2)sin263°-4cos60°sin63°+1+cos27°+cot30°-3tan30sin30°-cos45°.-数学

题目简介

计算:(1)sin30°+cos45°+tan60°-cot30°;(2)sin263°-4cos60°sin63°+1+cos27°+cot30°-3tan30sin30°-cos45°.-数学

题目详情

计算:(1)sin30°+cos45°+tan60°-cot30°;
(2)
sin263°-4cos60°sin63°+1
+cos27°+
cot30°-3tan30
sin30°-cos45°
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"1
2
+
2
2
+
3
-
3

=
1+
2
2

(2)原式=
sin263°-4×class="stub"1
2
sin63°+1
+cos27°+class="stub"cot30°-3tan30
sin30°-cos45°

=
sin263°-2sin63°+1
+cos27°+class="stub"cot30°-3tan30
sin30°-cos45°

=
(sin63°-1)2
+cos27°+
3
-3×
3
3
class="stub"1
2
-
2
2

=1-sin63°+cos27°+0
=1.

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