What is the value of sqrt(2)(cos(45)+isin(45)) ?

The value of sqrt(2)(cos(45)+isin(45)) is 1+i

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sqrt(2)(cos(45)+isin(45))

2 (cos (4 5^{\circ}) + i sin (4 5^{\circ}))

1 + i

Solution steps

2 (cos (4 5^{\circ}) + i sin (4 5^{\circ}))

Use the following trivial identity:

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\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{2}{2}

Use the following trivial identity:

sin (4 5^{\circ}) = \frac{2}{2}

sin (4 5^{\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{2}{2}

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

Simplify

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

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

Multiply

i \frac{2}{2} : \frac{2 i}{2}

i \frac{2}{2}

Multiply fractions:

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

= \frac{2 i}{2}

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

Combine the fractions

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

Apply rule

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

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

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

Remove parentheses:

(a) = a

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

Multiply fractions:

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

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

Cancel

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

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

Apply radical rule:

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

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

Apply exponent rule:

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

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

= \frac{2 + 2 i}{2 ^{1 - \frac{1}{2}}}

Subtract the numbers:

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

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

Apply radical rule:

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

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

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

Factor out common term

2

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

Cancel the common factor:

2

= 1 + i

= 1 + i

4 (sin (4) + cos (4) + 4 (cos (4) - sin (4)))

2 cos^{2} (1)

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

- 3.5 \cdot 3.5 \cdot sin (3.5 \cdot 2.4 - 0.8)

\frac{120}{tan ( 2 4 ^{\circ} )}

What is the value of sqrt(2)(cos(45)+isin(45)) ?
The value of sqrt(2)(cos(45)+isin(45)) is 1+i