Evaluate
90
Factor
2\times 3^{2}\times 5
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29+12+7+7+4+4+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 17 and 12 to get 29.
41+7+7+4+4+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 29 and 12 to get 41.
48+7+4+4+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 41 and 7 to get 48.
55+4+4+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 48 and 7 to get 55.
59+4+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 55 and 4 to get 59.
63+3+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 59 and 4 to get 63.
66+3+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 63 and 3 to get 66.
69+3+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 66 and 3 to get 69.
72+2+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 69 and 3 to get 72.
74+2+2+2+1+1+1+1+1+1+1+1+1+1
Add 72 and 2 to get 74.
76+2+2+1+1+1+1+1+1+1+1+1+1
Add 74 and 2 to get 76.
78+2+1+1+1+1+1+1+1+1+1+1
Add 76 and 2 to get 78.
80+1+1+1+1+1+1+1+1+1+1
Add 78 and 2 to get 80.
81+1+1+1+1+1+1+1+1+1
Add 80 and 1 to get 81.
82+1+1+1+1+1+1+1+1
Add 81 and 1 to get 82.
83+1+1+1+1+1+1+1
Add 82 and 1 to get 83.
84+1+1+1+1+1+1
Add 83 and 1 to get 84.
85+1+1+1+1+1
Add 84 and 1 to get 85.
86+1+1+1+1
Add 85 and 1 to get 86.
87+1+1+1
Add 86 and 1 to get 87.
88+1+1
Add 87 and 1 to get 88.
89+1
Add 88 and 1 to get 89.
90
Add 89 and 1 to get 90.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
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}