Prove the identity. cos( x - 1 ) - sin( x + ) =0 Use the Addition and Subtraction Formulas, and simplify. cos ( x - " ) - sin ( x + 35 ) = (cos( x) ) ( + (sin(x)) ( sin ())) - ((sin(x))(cos(#)) +(cos(x))( sin(;))) = (cos(x) ) )+ ( sinco ) ( = ) - ( since) ) ( = ) - ( cosco ) ( 1 3 )