delete mode 100644 lib/libc/musl/src/math/atan.c
 delete mode 100644 lib/libc/musl/src/math/atanf.c
 delete mode 100644 lib/libc/musl/src/math/atanl.c
 delete mode 100644 lib/libc/musl/src/math/i386/atan.s
 delete mode 100644 lib/libc/musl/src/math/i386/atanf.s
 delete mode 100644 lib/libc/musl/src/math/i386/atanl.s
 delete mode 100644 lib/libc/musl/src/math/x32/atanl.s
 delete mode 100644 lib/libc/musl/src/math/x86_64/atanl.s