Question

Derivative of cos(45)?

Answer 1

`-sin(45)`

Explanation:

In general, you can remember the fact that,

`d/dxsin(x)=cos(x)` and `d/dx cos(x)=-sin(x)`

So we have,

`d/dxcos(x) = -sin(x)`

`=> d/dxcos(45) = -sin(45)`

Hence the answer.
Hope it Helps :)