SCIENTIFIC CALCULATOR

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Ways of re-using calculations:
180 / 3  =   60.0 [1]
A: Using ans
sin(ans)**2 + cos(ans)**2  =   1.0 [2]
B: Clicking on equation number
sin([1])**2 + cos([1])**2  =   1.0 [3]
C: Clicking on left side of equation [1]
sin(180 / 3)**2 + cos(180 / 3)**2  =   1.0 [4]
D: Clicking on right side of equation [1]
sin(60)**2 + cos(60)**2  =   1.0 [5]
These methods are not equal...
int(rand * 1000)  =   905.0 [6]
... try methods A through D on equation [6].
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