What is the 4th derivative of the function f(x) = 2x^3 + 5x^2 - 8x + 3?
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What is the product of 25 multiplied by 12 divided by 3, added to 14 subtracted from 50?
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Find the value of sinh(cos^-1(4/5)) + cosh(tan^-1(-3/4)), where sinh(x) represents the hyperbolic sine function and cosh(x) denotes the hyperbolic cosine function.