giúp j vậy

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Bài 3:

b: \(10^6-5^7=5^6\left(2^6-5\right)=5^6\cdot59⋮59\)

1.she spends 20 minutes to draw a picture

2.Lan is the most creative in the group

3.No one is smaller than him

4.My pen isn't the same than mine

5.Lan is jealous than her

6.My brother no longer raise pets

-chúc bạn thật thông minh!!!!

a: góc đối đỉnh với góc yOv là góc uOz

b: góc uOz=góc yOv

mà góc yOv=110 độ

nên góc uOz=110 độ

c; Ot là phân giác của góc uOz

=>góc uOt=1/2*góc uOz

=>x=1/2*110=55 độ

Dạng 2: 

a) \(\left(1-\cos\alpha\right)\left(1+\cos\alpha\right)=1-\cos^2\alpha=\sin^2\alpha\)

b) \(\sin\alpha-\sin\alpha\cdot\cos^2\alpha=\sin\alpha\left(1-\cos^2\alpha\right)=\sin^3\alpha\)

c) Ta có: \(\sin^4\alpha+\cos^4\alpha+2\cdot\sin^2\alpha\cdot\cos^2\alpha\)

\(=\left(\sin^2\alpha+\cos^2\alpha\right)^2\)

\(=1^2=1\)

d) Ta có: \(\tan^2\alpha-\sin^2\alpha\cdot\tan^2\alpha\)

\(=\tan^2\alpha\left(1-\sin^2\alpha\right)\)

\(=\tan^2\alpha\cdot\cos^2\alpha\)

\(=\dfrac{\sin^2\alpha}{\cos^2\alpha}\cdot\cos^2\alpha=\sin^2\alpha\)

Baif mấy bạn ơi ???