Calculation: lD5LCx - 1

x  = 
 x_m* cos( ω* t* φ)
x =  x_m* cos( ω* t* φ)x = x_m*cos(ω*t*φ)
x =  cos( t* φ* ω)* x_mx = cos(t*φ*ω)*x_m