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