Evaluate
-3
Real Part
-3
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-4-9i+\left(1+9i\right)
The opposite of -1-9i is 1+9i.
-4+1+\left(-9+9\right)i
Combine the real and imaginary parts in numbers -4-9i and 1+9i.
-3
Add -4 to 1. Add -9 to 9.
Re(-4-9i+\left(1+9i\right))
The opposite of -1-9i is 1+9i.
Re(-4+1+\left(-9+9\right)i)
Combine the real and imaginary parts in numbers -4-9i and 1+9i.
Re(-3)
Add -4 to 1. Add -9 to 9.
-3
The real part of -3 is -3.
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
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