If sinβ is the harmonic mean of sinα and cosα , and sinθ is the arithmetic mean of sinα and cosα , then which of the following is/are correct?
1. √2sin(α + π/4)sin = sin2α
2. √2sinθ = cos(α - π/4)
Select the correct answer using the code given below:
a. 1 only
b. 2 only
c. Both 1 and 2
d. Neither 1 nor 2