问题
解答题
计算:sin30°tan45°-cos230°tan230°.
答案
sin30°tan45°-cos230°tan230°
=
×1-(1 2
)2×(3 2
)23 3
=
-1 2
×3 4 1 3
=
.1 4
计算:sin30°tan45°-cos230°tan230°.
sin30°tan45°-cos230°tan230°
=
×1-(1 2
)2×(3 2
)23 3
=
-1 2
×3 4 1 3
=
.1 4