(1)原式=22[12sin(π4-x)+32cos(
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![(1)原式=22[12sin(π4-x)+32cos(](/uploads/image/z/16788368-56-8.jpg?t=%EF%BC%881%EF%BC%89%E5%8E%9F%E5%BC%8F%3D22%5B12sin%EF%BC%88%CF%804-x%EF%BC%89%2B32cos%EF%BC%88)
(1)原式=2
2[
1
2sin(
π
4-x)+
3
2cos(
π
4-x)]=2
2[sin
π
6sin(
π
4-x)+cos
π
6cos(
π
4-x)]
=2
2cos(
π
6-
π
4+x)=2
2cos(x-
π
12)
(2)原式=
cos2α
1-tanα
1+tanα[1-cos(
π
2+2α)]=
cos2α
cos2α
1+sin2α(1+sin2α)=1
2[
1
2sin(
π
4-x)+
3
2cos(
π
4-x)]=2
2[sin
π
6sin(
π
4-x)+cos
π
6cos(
π
4-x)]
=2
2cos(
π
6-
π
4+x)=2
2cos(x-
π
12)
(2)原式=
cos2α
1-tanα
1+tanα[1-cos(
π
2+2α)]=
cos2α
cos2α
1+sin2α(1+sin2α)=1
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