Question

y=cosx-tanx derivative​

Answer 1

Answer:

-sinx - sec²x

Hope you understand the answer

and to solve this question you should know that:

diff(cos x) = -sinx

and

diff(tan x) = sec²x

Answer 2

Answer:

dif(cos(x))_dif(tan(x))

=sin(x)_sec^2(x)