What is the critical cos(2x) ?

The critical cos(2x) is x=pin,x= pi/2+pin

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critical cos(2x)

critical points

cos (2 x)

x = πn, x = \frac{π}{2} + πn

Solution steps

cos (2 x)

Find where

f^{'} (x)

is equal to zero or undefined

x = πn, x = \frac{π}{2} + πn

Identify critical points not in

f (x)

domain

Domain of

cos (2 x) : - \infty < x < \infty

All critical points are in domain

x = πn, x = \frac{π}{2} + πn

f (x) = x^{2} - x - 12

f (x) = 3 x^{(\frac{2}{3})} - 2 x

f (x) = 2.6 + 1.4 x - 0.2 x^{2}

(3, - 1), (4, 7)

f (x) = 5 x^{2} + 5