问题
解答题
计算:sin230°+2sin60°+tan45°-tan60°+cos230°.
答案
原式=(
)2+2×1 2
+1-3 2
+(3
)23 2
=
+1 4
+1-3
+3 3 4
=1+1
=2.
计算:sin230°+2sin60°+tan45°-tan60°+cos230°.
原式=(
)2+2×1 2
+1-3 2
+(3
)23 2
=
+1 4
+1-3
+3 3 4
=1+1
=2.