Trigonometric Identities Question

[Jmatthew30]

V1=40sin(4t)
V2=Acos(4t)
V1+V2=V0
Where V0=50sin(4t+a)
Find magnitude of A
Struggling to see how I can use the double angle formulae to find A

 

[Deleted member 4993]

V1=40sin(4t)
V2=Acos(4t)
V1+V2=V0
Where V0=50sin(4t+a)
Find magnitude of A
Struggling to see how I can use the double angle formulae to find A

Can you expand:

50 * sin(4t+a)

Please show us what you get.