You idiot you answered your own question!
 
        
             
        
        
        
64/4 is 16 if that's what you meant.
        
                    
             
        
        
        
Answer:
cot(∅) = 
Step-by-step explanation:
tan ∅ and cot ∅ are inverse functions
therefore the inverse of 
tan ∅ = √15 / 10
is equal to 
cot ∅ = 10 / √15
Rationalizing the denominator 
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 * 
cot ∅ = 
 
        
             
        
        
        
Answer: -1.3125
Step-by-step explanation:
(-1/4 - 1/2) = -0.75
-0.75/ = -1.3125
 = -1.3125