Mikä on polaarisen käyrän f (theta) = theta-sec ^ 3-beta + thetasin ^ 3theta kaltevuus teeta = (5pi) / 8?

Mikä on polaarisen käyrän f (theta) = theta-sec ^ 3-beta + thetasin ^ 3theta kaltevuus teeta = (5pi) / 8?
Anonim

Vastaus:

# Dy / dx = -0,54 #

Selitys:

Polaarinen toiminto #F (theta) #, # Dy / dx = (f '(theta) sintheta + f (theta) costheta) / (f' (theta) costheta-f (theta) sintheta) #

#f (theta) = theeta-s ^ 3theta + thetasin ^ 3theta #

#f "(theta) = 1-3 (s ^ 2theta) (d / dx sectheta) - sin ^ 3theta + 3thetasin ^ 2theta (d / dx sintheta) #

#f "(theta) = 1-3sec ^ 3thetatantheta-sin ^ 3theta + 3thetasin ^ 2thetacostheta #

#f '((5pi) / 3) = 1-3sec ^ 3 ((5pi) / 3) tan ((5pi) / 3) sin ^ 3 ((5pi) / 3) + 3 ((5pi) / 3) sin ^ 2 ((5pi) / 3) cos ((5pi) / 3) ~~ -9,98 #

#f ((5pi) / 3) = ((5pi) / 3) -sek ^ 3 ((5pi) / 3) + ((5pi) / 3) sin ^ 3 ((5pi) / 3) ~~ -6,16 #

# Dy / dx = (- 9.98sin ((5pi) / 3) -6.16cos ((5pi) / 3)) / (- 9.98cos ((5pi) / 3) + 6.16sin ((5pi) / 3)) = -0,54 #