What is the critical y=cos((3x)/7) ?

The critical y=cos((3x)/7) is x=(14pi)/3 n,x=(7pi)/3+(14pi)/3 n

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critical y=cos((3x)/7)

critical points

y = cos (\frac{3 x}{7})

x = \frac{14 π}{3} n, x = \frac{7 π}{3} + \frac{14 π}{3} n

Solution steps

cos (\frac{3 x}{7})

Find where

f^{'} (x)

is equal to zero or undefined

x = \frac{14 π}{3} n, x = \frac{7 π}{3} + \frac{14 π}{3} n

Identify critical points not in

f (x)

domain

Domain of

cos (\frac{3 x}{7}) : - \infty < x < \infty

All critical points are in domain

x = \frac{14 π}{3} n, x = \frac{7 π}{3} + \frac{14 π}{3} n

x^{2} + x y + y^{2} - 19 y + 120

x = x y - 3 y - 4

\frac{1}{5} x^{3} + x^{2} - 2 x

- 6 x^{4}

f (x, y) = x^{2} - y^{2} - 8 x + 6 y + 5

What is the critical y=cos((3x)/7) ?
The critical y=cos((3x)/7) is x=(14pi)/3 n,x=(7pi)/3+(14pi)/3 n