Question

given sin square beta = sin alpha cos alpha show that cos 2 beta = 2 cos (π/4+alpha)

Answer 1

Answer:

In question cos 2 beta = 2 cos^2 (π/4 + alpha) but in right hand side square is not there for cos

please let me know if i am wrong

Step-by-step explanation:

please refer the attachment

Answer 2

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