Ano ang slope ng polar curve f (theta) = theta - sec ^ 3theta + thetasin ^ 3theta sa theta = (5pi) / 8?

Ano ang slope ng polar curve f (theta) = theta - sec ^ 3theta + thetasin ^ 3theta sa theta = (5pi) / 8?
Anonim

Sagot:

# dy / dx = -0.54 #

Paliwanag:

Para sa isang polar function #f (theta) #, # dy / dx = (f '(theta) sintheta + f (theta) costheta) / (f' (theta) costheta-f (theta) sintheta) #

#f (theta) = theta-sec ^ 3theta + thetasin ^ 3theta #

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

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

(5pi) / 3) = 1-3sec ^ 3 ((5pi) / 3) tan ((5pi) / 3) - sa ^ 3 ((5pi) / 3) +3 ((5pi) / 3) sin ^ 2 ((5pi) / 3) cos ((5pi) / 3) ~~ -9.98 #

(5pi) / 3) -ec ^ 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 #