Phase error between two signals ?

Hello, i have two inputs

 V1=A1sin(wt)

and

V2=A2cos(wt+theta)

knowing that A1 is diffrent to A2 ... i want to find Theta how can i do that in simulink ? thanks in advance

[Birdman]

What do you mean by finding theta? Do you try to solve an equation?

[El Mehdi FADEL]

theta is the phase error between the inputs ... i want to detect this error ( finding Theta ) and correct it

[Birdman]

What have you done so far? I still don't understand what you want.

[El Mehdi FADEL]

i want to calculate this theta on simulink ... that's what i want to do ?