问题
填空题
2cos40°(1+
|
答案
2cos40°(1+
tan10°)3
=2cos40°(1+
•3
)sin10° cos10°
=2
(cos10°+cos40° cos10°
sin10°)3
=2
•2sin40°cos40° cos10°
=2sin80° cos10°
=2.
故答案为:2.
2cos40°(1+
|
2cos40°(1+
tan10°)3
=2cos40°(1+
•3
)sin10° cos10°
=2
(cos10°+cos40° cos10°
sin10°)3
=2
•2sin40°cos40° cos10°
=2sin80° cos10°
=2.
故答案为:2.