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Mathematics
KG
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13 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
C18: cho cos=4/5 với 0<anfa<pi/2.tính sin anfa
Sin anfa=1/5
-1/5
3/5
+-3/5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho anfa=-4/5 với 3pi/2<anfa<2pi khi đó
Sina=4/căn41,cos 5căn 41
Sina=-4/căn41,cosa=5/căn41
Sina=4/căn41,cosa=-5/căn 41
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho cosa =-2/5(pi/2<a<pi) khi đó tana =
Căn 21/3
-căn 21/5
Căn 21/5
-căn 21/2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Nghiệm của prtinh sin3x=cosx là
X=k pi;x=k pi/2
X=pi/8+k pi/2;x=pi/4+k pi
X=k2pi;x=pi/2+k2pi
X=k pi; x=pi/4 +kpi
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pt cosx= cos pi/3 có tat cả cac nghịm là
X=2pi/3+k2pi(kEz)
X=+-pi/3+k pi
X=+-pi/3+k2pi
=pi/3+k2pi
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
tìm txd D của hàm số y=2025/sinx
R
R\{0}
R\{kpi,kEz}
R\{pi/2+k pi,kEz)
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trg cac ham so sau, ham so nao co do thi doi xung qua truc tung
Y=sinx cosx
Y=sin5x.cos(x-pi/2)
y=tanx/tan2 x+1
y=cosxsin3x
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