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Popular >

cos(3x)=(sqrt(3))/3

Solution

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

Solution

x = \frac{0.95531 \dots}{3} + \frac{2 πn}{3}, x = \frac{2 π}{3} - \frac{0.95531 \dots}{3} + \frac{2 πn}{3}

+1

Degrees

x = 18.24520 \dots^{\circ} + 12 0^{\circ} n, x = 101.75479 \dots^{\circ} + 12 0^{\circ} n

Solution steps

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

Apply trig inverse properties

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

General solutions for

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

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

3 x = arccos (\frac{3}{3}) + 2 πn, 3 x = 2 π - arccos (\frac{3}{3}) + 2 πn

3 x = arccos (\frac{3}{3}) + 2 πn, 3 x = 2 π - arccos (\frac{3}{3}) + 2 πn

Solve

3 x = arccos (\frac{3}{3}) + 2 πn : x = \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

3 x = arccos (\frac{3}{3}) + 2 πn

Simplify

arccos (\frac{3}{3}) + 2 πn : arccos (\frac{1}{3}) + 2 πn

arccos (\frac{3}{3}) + 2 πn

\frac{3}{3} = \frac{1}{3}

\frac{3}{3}

Apply radical rule:

n a = a^{\frac{1}{n}}

3 = 3^{\frac{1}{2}}

= \frac{3 ^{\frac{1}{2}}}{3}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{3 ^{\frac{1}{2}}}{3 ^{1}} = \frac{1}{3 ^{1 - \frac{1}{2}}}

= \frac{1}{3 ^{1 - \frac{1}{2}}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{1}{3 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

3^{\frac{1}{2}} = 3

= \frac{1}{3}

= arccos (\frac{1}{3}) + 2 πn

3 x = arccos (\frac{1}{3}) + 2 πn

Divide both sides by

3

3 x = arccos (\frac{1}{3}) + 2 πn

Divide both sides by

3

\frac{3 x}{3} = \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

Simplify

\frac{3 x}{3} = \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

\frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3} : \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

\frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

arccos (\frac{1}{3}) = arccos (\frac{3}{3})

arccos (\frac{1}{3})

= arccos (\frac{3}{3})

= \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

Solve

3 x = 2 π - arccos (\frac{3}{3}) + 2 πn : x = \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

3 x = 2 π - arccos (\frac{3}{3}) + 2 πn

Simplify

2 π - arccos (\frac{3}{3}) + 2 πn : 2 π - arccos (\frac{1}{3}) + 2 πn

2 π - arccos (\frac{3}{3}) + 2 πn

\frac{3}{3} = \frac{1}{3}

\frac{3}{3}

Apply radical rule:

n a = a^{\frac{1}{n}}

3 = 3^{\frac{1}{2}}

= \frac{3 ^{\frac{1}{2}}}{3}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{3 ^{\frac{1}{2}}}{3 ^{1}} = \frac{1}{3 ^{1 - \frac{1}{2}}}

= \frac{1}{3 ^{1 - \frac{1}{2}}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{1}{3 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

3^{\frac{1}{2}} = 3

= \frac{1}{3}

= 2 π - arccos (\frac{1}{3}) + 2 πn

3 x = 2 π - arccos (\frac{1}{3}) + 2 πn

Divide both sides by

3

3 x = 2 π - arccos (\frac{1}{3}) + 2 πn

Divide both sides by

3

\frac{3 x}{3} = \frac{2 π}{3} - \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

Simplify

\frac{3 x}{3} = \frac{2 π}{3} - \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

Simplify

\frac{3 x}{3} : x

\frac{3 x}{3}

Divide the numbers:

\frac{3}{3} = 1

= x

Simplify

\frac{2 π}{3} - \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3} : \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

\frac{2 π}{3} - \frac{arccos ( \frac{1}{3} )}{3} + \frac{2 πn}{3}

arccos (\frac{1}{3}) = arccos (\frac{3}{3})

arccos (\frac{1}{3})

= arccos (\frac{3}{3})

= \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

x = \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}, x = \frac{2 π}{3} - \frac{arccos ( \frac{3}{3} )}{3} + \frac{2 πn}{3}

Show solutions in decimal form

x = \frac{0.95531 \dots}{3} + \frac{2 πn}{3}, x = \frac{2 π}{3} - \frac{0.95531 \dots}{3} + \frac{2 πn}{3}

Graph

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