What is the value of 3(cos(30)+i*sin(30)) ?

The value of 3(cos(30)+i*sin(30)) is (3sqrt(3))/2+i 3/2

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3(cos(30)+i*sin(30))

3 (cos (3 0^{\circ}) + i \cdot sin (3 0^{\circ}))

\frac{3 3}{2} + i \frac{3}{2}

Solution steps

3 (cos (3 0^{\circ}) + i sin (3 0^{\circ}))

Use the following trivial identity:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

Use the following trivial identity:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= 3 (\frac{3}{2} + i \frac{1}{2})

Simplify

3 (\frac{3}{2} + i \frac{1}{2}) : \frac{3 3}{2} + i \frac{3}{2}

3 (\frac{3}{2} + i \frac{1}{2})

i \frac{1}{2} = \frac{i}{2}

i \frac{1}{2}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 i}{2}

Multiply:

1 i = i

= \frac{i}{2}

= 3 (\frac{3}{2} + \frac{i}{2})

Simplify

\frac{3}{2} + \frac{i}{2} : \frac{3 + i}{2}

\frac{3}{2} + \frac{i}{2}

Apply rule

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{3 + i}{2}

= 3 \cdot \frac{3 + i}{2}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( 3 + i ) \cdot 3}{2}

Rewrite

\frac{( 3 + i ) \cdot 3}{2}

in standard complex form:

\frac{3 3}{2} + \frac{3}{2} i

\frac{( 3 + i ) \cdot 3}{2}

Expand

(3 + i) \cdot 3 : 33 + 3 i

(3 + i) \cdot 3

= 3 (3 + i)

Apply the distributive law:

a (b + c) = ab + a c

a = 3, b = 3, c = i

= 33 + 3 i

= \frac{3 3 + 3 i}{2}

Apply the fraction rule:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{3 3 + 3 i}{2} = \frac{3 3}{2} + \frac{3 i}{2}

= \frac{3 3}{2} + \frac{3 i}{2}

= \frac{3 3}{2} + \frac{3}{2} i

= \frac{3 3}{2} + i \frac{3}{2}

arccos (- 0.24)

\frac{2 ( 1 + sin ( \frac{π}{3} ) )}{2 ( \frac{π}{3} - cos ( \frac{π}{3} ) )}

cos (\frac{π}{8}) - sin (\frac{π}{8})

(tan (6 0^{\circ})) (30)

15 cos (3 5^{\circ})

What is the value of 3(cos(30)+i*sin(30)) ?
The value of 3(cos(30)+i*sin(30)) is (3sqrt(3))/2+i 3/2