Manipulate—Wolfram Language Documentation
https://reference.wolfram.com/language/ref/Manipulate.html
Manipulate[expr, {u, umin, umax}] generates a version of expr with controls added to allow interactive manipulation of the value of u. Manipulate[expr, {u, umin, umax, du}] allows the value of u to vary between umin and umax in steps du. Manipulate[expr, {{u, uinit}, umin, umax, ...}] takes the initial value of u to be uinit. Manipulate[expr, {{u, uinit, ulbl}, ...}] labels the controls …
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