Step-by-step explanation:
- 90-27=63°
- <2
- <2,<4
- 360°
 
        
                    
             
        
        
        
Answer:
See explanation
Step-by-step explanation:
1 step:
n=1, then

So, for j=1 this statement is true
2 step:
Assume that for n=k the following statement is true

3 step:
Check for n=k+1 whether the statement

is true.
Start with the left side:

According to the 2nd step,

Substitute it into the 

So, you have proved the initial statement
 
        
             
        
        
        
Answer:
a)  ,
,  ,
,  
   
b)  ,
,  ,
,  
   
Step-by-step explanation:
We can use the chain rule in the following form: is u=u(x) is a differentiable function depending on x and y=y(u) is a differentiable function depending on u, then  .
.
a)  from the power rule.
 from the power rule.  
 .
. 
From the previous parts and the chain rule,  
   
b)  
   
 from the power and sum rules.
 from the power and sum rules.
Then, 