F(x)=cosx (5-x^2) f(x)=3x^8-7x-2,5 f(x)6/x^4- x^5/2 +2√x

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There are a few issues with the notation in your question, so I'll provide solutions for the possible interpretations:

If you want to find the composite function F(f(x)), where F(x) = cos(x)(5 - x^2) and f(x) = 3x^8 - 7x - 2.5, you would first substitute f(x) into F(x) to get F(f(x)):

F(f(x)) = cos(3x^8 - 7x - 2.5)(5 - (3x^8 - 7x - 2.5)^2)

If you want to simplify the expression f(x) = 6/x^4 - x^5/2 + 2√x, you would first combine the terms and simplify:

f(x) = 6/x^4 - x^5/2 + 2√x

If you want to evaluate the function f(x) = 6/x^4 - x^5/2 + 2√x at a specific value of x, you would plug in that value for x and compute the result.