A) A =AASIN4 4 2 2ACOSCOS5−COS 2COS1(2Π ΠA)=−+XK24B) (TGA + TGB).CO...
Bài2: a)
a
=
a
sin
4
4
2
2
a
cos
5
−
cos
2
1
(
2
π
π
)
=
+
x
k
24
b) (tga + tgb).cotg(a + b) + (tga -
tgb).cotg(a + b) = 2
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a
=
a
sin
4
4
2
2
a
cos
5
−
cos
2
1
(
2
π
π
)
=
+
x
k
24