Asked by aisha
                find derivative
y= 3x^5-6x^3/7secx
 
find dy/dx
* xcosy= 5( y+cosx)
* X^5-Y^3+8XY=466
* A RIGHT TRIANGLE HAS LEGS OF LENGTH 15M AND 7M. THE 7M LEG IS NOT CHANGING. 15M LEG IS GETTING LONGER AT RATE OF 8M PER SECOND. SO WHAT IS RATE OF CHANGE OF THE HYPOTENUSE?
            
            
        y= 3x^5-6x^3/7secx
find dy/dx
* xcosy= 5( y+cosx)
* X^5-Y^3+8XY=466
* A RIGHT TRIANGLE HAS LEGS OF LENGTH 15M AND 7M. THE 7M LEG IS NOT CHANGING. 15M LEG IS GETTING LONGER AT RATE OF 8M PER SECOND. SO WHAT IS RATE OF CHANGE OF THE HYPOTENUSE?
Answers
                    Answered by
            Steve
            
    need parentheses on 1st
in any case, use quotient rule. what do you get?
x cosy = 5y + 5cosx
cosy - x*siny y' = 5y' - 5sinx
y'(x siny + 5) = cosy + 5sinx
y' = (cosy+5sinx)/(x siny+5)
h^2 = x^2+y^2
2h dh/dt = 2x dx/dt + 2y dy/dt
2√274 dh/dt = 0 + 2*15*8
dh/dt = 120/√274
    
in any case, use quotient rule. what do you get?
x cosy = 5y + 5cosx
cosy - x*siny y' = 5y' - 5sinx
y'(x siny + 5) = cosy + 5sinx
y' = (cosy+5sinx)/(x siny+5)
h^2 = x^2+y^2
2h dh/dt = 2x dx/dt + 2y dy/dt
2√274 dh/dt = 0 + 2*15*8
dh/dt = 120/√274
                    Answered by
            aisha
            
    where did you
get 274 from
    
get 274 from
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