Welcoming you in another post of the series “Trigonometry”. We shall discuss four very important formulas of Trigonometry which is widely known as “Product to Sum Formula”.
\(2\sin{\text{A}}\cos{\text{B}}=\sin(\text{A}+\text{B})+\sin(\text{A}-\text{B})\)
\(2\cos{\text{A}}\sin{\text{B}}=\sin(\text{A}+\text{B})-\sin(\text{A}-\text{B})\)
\(2\cos{\text{A}}\cos{\text{B}}=\cos(\text{A}-\text{B})+\cos(\text{A}+\text{B})\)
\(2\sin{\text{A}}\sin{\text{B}}=\cos(\text{A}-\text{B})-\cos(\text{A}+\text{B})\)
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