1) y=4+5x + 7x³. Find dy/dx

Question

2) if y= tan x cos²x then dy by dx will be-

Answer 1

1) 0 + 5 + 21 x^2

2) tan x (d cos^2 x /dx)+ cos^2 x d tan x / dx

= tan x (-2 sin x cos x) + cos^2 x (sec^2 x)

= -2 sin^2 x + 1