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In the first problems, calculate f'(x)

In the first problems, calculate f'(x) · x'(t) when t = 3 and use
these values to determine the value of d/dt (f(x(t))) when t = 3.
1) f(x) = tan^3(x), x = 8

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2) f(x) = 2x + cos(x) so f(0) = 1. Without graphing the function, you can be certain that f has how many positive roots?
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3)calculate the limit of each expression as “x→ ∞.”
4 – 3x / x + 8
please show work clear

 
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