Evaluate
-\frac{6}{13}+\frac{4}{13}i\approx -0.461538462+0.307692308i
Real Part
-\frac{6}{13} = -0.46153846153846156
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\frac{2i}{2-3i}
Calculate 1+i to the power of 2 and get 2i.
\frac{2i\left(2+3i\right)}{\left(2-3i\right)\left(2+3i\right)}
Multiply both numerator and denominator by the complex conjugate of the denominator, 2+3i.
\frac{-6+4i}{13}
Do the multiplications in \frac{2i\left(2+3i\right)}{\left(2-3i\right)\left(2+3i\right)}.
-\frac{6}{13}+\frac{4}{13}i
Divide -6+4i by 13 to get -\frac{6}{13}+\frac{4}{13}i.
Re(\frac{2i}{2-3i})
Calculate 1+i to the power of 2 and get 2i.
Re(\frac{2i\left(2+3i\right)}{\left(2-3i\right)\left(2+3i\right)})
Multiply both numerator and denominator of \frac{2i}{2-3i} by the complex conjugate of the denominator, 2+3i.
Re(\frac{-6+4i}{13})
Do the multiplications in \frac{2i\left(2+3i\right)}{\left(2-3i\right)\left(2+3i\right)}.
Re(-\frac{6}{13}+\frac{4}{13}i)
Divide -6+4i by 13 to get -\frac{6}{13}+\frac{4}{13}i.
-\frac{6}{13}
The real part of -\frac{6}{13}+\frac{4}{13}i is -\frac{6}{13}.
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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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Matrix
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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}