The dots/period between f and g, I assume this is the symbol for composition of function f and g?

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The dots/period between f and g, I assume this is the symbol for composition of function f and g?

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(F.G)x sub's. Given figure
((5x+2)(6x-1))x
=(30x^2+7x-2)x
And=30x^3+7x^2-2x