Evaluate
4+i
Real Part
4
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1+i^{21}+3
Calculate i to the power of 8 and get 1.
1+i+3
Calculate i to the power of 21 and get i.
4+i
Do the additions.
Re(1+i^{21}+3)
Calculate i to the power of 8 and get 1.
Re(1+i+3)
Calculate i to the power of 21 and get i.
Re(4+i)
Do the additions in 1+i+3.
4
The real part of 4+i is 4.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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y = 3x + 4
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}