Answer:
cos x ≠ 0 ⇔ x ≠  ; k ∈ N
 ; k ∈ N

<=> cos²x + sin²x = 1
⇔ 1 = 1
=> x =  { R \ (pi/2 + k.pi); k ∈ N}
Step-by-step explanation:
 
        
             
        
        
        
Let the width be w
Width = w
Length = w + 6
Area = a
a = w(w + 6)
a = w² + 6w
Answer: a = w² + 6w
        
                    
             
        
        
        
Step-by-step explanation:
here,
 principal (p)=£6000
Rate (R)=. 3.4%
time (t)=3 yrs
now,
total investment is compound amount i.e CA
 here,

 =£6000(1+3.4/100)^3
 =£6633.044
here he will get his total investment as £6633.044 in compound interest of 3.4%
 
        
             
        
        
        
(4x20)+30=$110 taken out. if he had $96 put back in, then go $110-$96, leaving a balance of -$14, or in other words, the balance dropped $14.