Answer:
We know that,
sin2x = 2 sinx cosx …(i)
Here, we don’t have the value of sin x. So, firstly we have to find the value of sinx
We know that,
cos2 x + sin2 x = 1
Putting the values, we get
Putting the value of sinx and cosx in eq. (i), we get
sin2x = 2sinx cosx