Question

Find the value 7 tita between 0° and 180° for the ff

Answer 1

Answer:

80  

∘

θ<270  

∘

⇒90  

∘

<  

2

θ

​

<135  

∘

 

cos  

2

θ=1−sin  

2

θ=1−  

25

9

​

=  

25

16

​

 

180  

∘

<θ<270  

∘

 

cos  

2

θ=  

25

16

​

⇒cosθ=−  

5

4

​

 

cos  

2

 

2

θ

​

=  

2

1+cosθ

​

=  

2

1−4/5

​

=  

10

1

​

 

90  

∘

<θ/2<135  

∘

 

cos  

2

(θ/2)=  

10

1

​

 

⇒cos(θ/2)=−  

10

​

 

1

​

Step-by-step explanation: