- Prove :::: arctan1/a+b + arctan1/a+c = arctan1/a ?

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Use the leading coefficient test to determine the end behavior of the polynomial function. Pls help idk how to do this
f(x)= 4x^3-4x^2+4x-2? The revenue achieved by selling x caclulators = x(40-.5x) dollars. Each costs 32$. How many will it take to make a profit of at least 27.50$? List a pair of numbers that have a gcf of 5? Are fixed points of function f(x)=x/2+1/x attracting or repelling? A projectile has horizontal range, R and maximum height, h. Find an expression for its initial speed. (Does not depend on theta)?