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ctanf, ctan, ctanl

From cppreference.com

< c‎ | numeric‎ | complex

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support (C11)
Technical Specifications
Symbol index

Common mathematical functions
Floating-point environment (C99)
Pseudo-random number generation
Complex number arithmetic (C99)
Type-generic math (C99)
Bit manipulation (C23)
Checked integer arithmetic (C23)

Complex number arithmetic

Types and the imaginary constant

complex (C99)
_Complex_I (C99)
CMPLX (C11)

imaginary (C99)
_Imaginary_I (C99)
I (C99)

Manipulation

cimag (C99)
creal (C99)
carg (C99)

cabs (C99)
conj (C99)
cproj (C99)

Power and exponential functions

cexp (C99)
clog (C99)

cpow (C99)
csqrt (C99)

Trigonometric functions

ccos (C99)
csin (C99)
ctan (C99)

cacos (C99)
casin (C99)
catan (C99)

Hyperbolic functions

ccosh (C99)
csinh (C99)
ctanh (C99)

cacosh (C99)
casinh (C99)
catanh (C99)

Defined in header `<complex.h>`
float