问题 解答题
计算:sin266°-tan54°tan36°+sin224°+sin230°+cos230°+
tan260°
cot260°
答案

sin266°-tan54°tan36°+sin224°+sin230°+cos230°+

tan260°
cot260°

=(sin266°+sin224°)-1+(

1
2
2+(
3
2
2+
(
3
)2
(
3
3
)2

=1-1+

1
4
+
3
4
+9

=10.

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