brace indexing not supported

Hello everyone, could you please give me hints on how to fix this error in the figure attached?

Thank you in advance!

Answer 1

[madhan ravi]

 d_A_3(9)

[Maurilio Matracia]

Thanks, however I am trying to use indices because there are many of these functions and I can implement them in a for loop.

So my question is how to fix this problem still using brace indexing, since I think is the only way to stack function handles together.

[madhan ravi]

d = {@sin,@cos}
d{1}(0)
d{2}(0)