InverseFourierCosTransform

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

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

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