book Maths Puzzle Numerical Ability

how do u find the intercepts of the line ?

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I really need help on this one. I need to find the derivative of this equation: f(x)= x to the 4 minus x to the sixth plus cos(2x). Would you please help I need help solving this problem, i need to reduce to the lowest term, and fractional form if possible. No answers can be expressed as mixed numbers. Thanks for any help here,