问题
解答题
计算题cos245°+tan60°cos30°+cos260°+sin260.
答案
原式=(
)2+2 2
×3
+(3 2
)2+(1 2
)2=3 2
+1 2
+3 2
+1 4
=3.3 4
计算题cos245°+tan60°cos30°+cos260°+sin260.
原式=(
)2+2 2
×3
+(3 2
)2+(1 2
)2=3 2
+1 2
+3 2
+1 4
=3.3 4