A) A = 2COSX.COSY A = (TGX + TGY)COTG(X + Y) + B = TG4A + (TGX - TGY)C...
Bài1: a) A = 2cosx.cosy
A = (tgx + tgy)cotg(x + y) +
B = tg4a
+ (tgx - tgy)cotg(x - y)
b) =
5
+
3
8
cos
2
x
B =
cos
sin
a
a
+
+
cos
sin
3
3
a
a
+
+
cos
sin
5
5
a
a
+
+
sin
cos
7
7
a
a
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