f(x)=9xsin(9x)

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Solution for f(x)=9xsin(9x) equation: 


Simplifying
f(x) = 9xsin(9x)

Multiply f * x
fx = 9xsin(9x)

Remove parenthesis around (9x)
fx = 9insx * 9x

Reorder the terms for easier multiplication:
fx = 9 * 9insx * x

Multiply 9 * 9
fx = 81insx * x

Multiply insx * x
fx = 81insx2

Solving
fx = 81insx2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = 81insx

Simplifying
f = 81insx

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