I don't know how to do these 4 question. Can someone explain or show how to do it.

1. Compute the derivatives of the functions x sin x tan x f (x) = g(x) = 2" tanx h(x) = x2 + cos x x COS X 2. Find the tangent to the graph of the function f (x) = sinx + cosx + x at the point (7 /4, v2 + ). TT / 2 3. Compute the definite integral cos x dx. (Hint: you can find a o function whose derivative is cos x...) 2 4. Compute the definite integral dx. (Hint: you can find a function 2-2 whose derivative is ... )