问题
解答题
计算：sin266°-tan54°tan36°+sin224°+sin230°+cos230°+
|
答案
sin266°-tan54°tan36°+sin224°+sin230°+cos230°+tan260° cot260°
=（sin266°+sin224°）-1+（
）2+（1 2
）2+3 2 (
)23 (
)23 3
=1-1+
+1 4
+93 4
=10．
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