i need help

d ) f : R = 83 ) > R, fly) = 2 x-1, For this function; find fullx) and X - 3 find whether the function is bijective ( also injective) e) Prove that fly)= cosx is a periodic function. Find the principal period as well. f ) x+sinx- cosx= 0. For this equation: show that there is a root between O to 17/ 4. 9 / Find the discontinues points of f(x)= 1xll + 11-x1/. h ) lim ( san ( x 21 ) + 1 x431 ) = 2 X