问题
填空题
已知α=
|
答案
∵α=
,∴2α=π 6
,π 3
∴cos4α-sin4α
=(cos2α+sin2α)(cos2α-sin2α)
=1×cos2α=cos2α=cos
=π 3
.1 2
故答案为:1 2
已知α=
|
∵α=
,∴2α=π 6
,π 3
∴cos4α-sin4α
=(cos2α+sin2α)(cos2α-sin2α)
=1×cos2α=cos2α=cos
=π 3
.1 2
故答案为:1 2