toán

toán

KG

13 Qs

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Assessment

Quiz

Mathematics

KG

Practice Problem

Hard

Created by

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13 questions

Show all answers

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

Media Image

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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