Question

On solving ǀ7 - 2x ǀ=5, we get the value of x as​

Answer 1

Answer:

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Step-by-step explanation:

8

1+∣cosx∣+cos

2

x+∣cos

3

x∣+.....

=4

3

⇒2

3(

1−∣cosx∣

1

)

=2

6

⇒

1−∣cosx∣

1

=2

⇒∣cosx∣=

2

1

⇒cosx=±

2

1

cosx=

2

1

⇒cosx=cos

3

π

⇒x=±

3

π

[∵cos(θ)=cos(−θ)]

cosx=−

2

1

⇒cosx=cos

3

2π

⇒x=±

3

2π

∴x=±

3

π

,±

3

2π

Answer By

Answer 2

Answer:

7-2x=5

2x=5+7

2x=12

x=12/2=6 ans