en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

cos(2pi*3)

Solution

cos (2 π \cdot 3)

Solution

1

Solution steps

cos (2 π 3)

Simplify

= cos (6 π)

cos (6 π) = cos (0)

cos (6 π)

Rewrite

6 π

as

2 π \cdot 3 + 0

= cos (2 π 3 + 0)

Apply the periodicity of

cos

:

cos (x + 2 π \cdot k) = cos (x)

cos (2 π \cdot 3 + 0) = cos (0)

= cos (0)

= cos (0)

Use the following trivial identity:

cos (0) = 1

cos (0)

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}

= 1

= 1

Popular Examples

34 sin (6 0^{\circ})

arctan((1.6)/(1.2))

arctan (\frac{1.6}{1.2})

(7sin(40))/(sin(80))

\frac{7 sin ( 4 0 ^{\circ} )}{sin ( 8 0 ^{\circ} )}

8 cos (18 0^{\circ})

tan (236. 3^{\circ})

Frequently Asked Questions (FAQ)

What is the value of cos(2pi*3) ?
The value of cos(2pi*3) is 1