What is the limit as x approaches pi/4 of cos(x) ?

The limit as x approaches pi/4 of cos(x) is (sqrt(2))/2

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limit as x approaches pi/4 of cos(x)

x \to \frac{π}{4} lim (cos (x))

\frac{2}{2}

Decimal

0.70710 \dots

Solution steps

x \to \frac{π}{4} lim (cos (x))

Plug in the value

x = \frac{π}{4}

= cos (\frac{π}{4})

Use the following trivial identity:

cos (\frac{π}{4}) = \frac{2}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{2}{2}

n \to \infty lim (n 10 n)

3 y^{^{'}} + y = 0

\frac{\partial}{\partial z} (x^{2} + 2 y^{2} + 3 z^{2})

\frac{\partial}{\partial x} (e^{- 5 x^{2} - y^{2}})

\int_{0}^{2} (e^{t} + e^{- t}) d t

What is the limit as x approaches pi/4 of cos(x) ?
The limit as x approaches pi/4 of cos(x) is (sqrt(2))/2