FourierCosTransform

FourierCosTransform[expr,t,ω] gives the symbolic Fourier cosine transform of expr. 

FourierCosTransform[expr,{t1,t2,…},{ω1,ω2,…}] gives the multidimensional Fourier cosine transform of expr. 

Please visit the official Wolfram Language Reference for more details and examples on core symbols.