We know that,
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Now, Let's solve !
Answer: see proof below
Explanation:
Use the Power Reducing Identity: sin² Ф = (1 - cos 2Ф)/2
Use the Double Angle Identity: sin 2Ф = 2 sin Ф · cos Ф
Use the following Sum to Product Identities:
Proof LHS → RHS
LHS = RHS: tan (A + B) = tan (A + B)
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