how do i correct this ? help me pls , i'm new to programming

Question

error: cannot convert 'double (*)(double)' to 'double'
115 | cout << sine ( xvalue ) <<endl;
| ^~~~~~
| |
| double (*)(double)
final.cpp:55:27: note: initializing argument 1 of 'long double sine(double)'
55 | long double sine ( double xvalue )
| ~~~~~~~^~~~~~

Answer 1

https://code.sololearn.com/cA20A233A21A
above is the link for my code
please help me figure the solution to run this program ...

@Martin Taylor thank you for the explanation