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.
计算:sin266°-tan54°tan36°+sin224°+sin230°+cos230°+
|
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.