1 answer:
Answer: see proof below
<u>Step-by-step explanation:</u>
Use the following Sum to Product Identities:

Use Even/Odd Identities: cos (-A) = - cos A
sin (-A) = sin (A)
Use Quotient Identity: 
<u>Proof LHS → RHS:</u>






LHS = RHS 
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Step-by-step explanation:
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Step-by-step explanation:
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