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This text involves several mathematical problems. Firstly, solving a linear equation with one unknown, 5x=1, involves isolating the variable x by dividing both sides by 5. Secondly, differentiating the function f(x)=5x involves applying the power rule, resulting in f'(x)=5. Thirdly, solving the quadratic equation 4x^2+5x+1=0 by factoring requires finding two numbers that multiply to 4 and add to 5. Lastly, the quintic trigonometric equation sin(5x)cos(5x)=1 is more complex and may require trigonometric identities or numerical methods for solution.

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